Archives For Product Information 101 Intros

Voltage Testers

eiodotcom —  October 8, 2012 — Leave a comment

Today’s EIO post is on Voltage Testers:

Making electrical repairs in your home can save you hundreds of dollars in service costs. One tool you’ll need to get started is a voltage tester. If you have a voltage tester, you can test outlets and light switches to see if voltage is present in their circuits. The most basic type of voltage tester consists of a small, pen-like device with a red lead and black lead extending from it.

What is a Voltage Meter?

    • A voltage meter is a device that is used to measure the strength of an electrical current flowing within an electrical circuit. Essentially what it does is measure the electrical potential (the strength of an electrical charge) at two specific points within the circuit. It then compares these potentials and presents the difference between the two. This difference is the rate at which current florws through the circuit. Voltage meters can be analog devices which use an arrow to indicate the electrical potential, while digital ones provide a read-out.

    Structure

    • At the center of the voltage meter is a magnet connected at both ends to pieces of magnetized iron. Sitting between the ends of the magnet is a cylinder made of iron. Because of its placement, the cylinder sits within both the positive and negative fields put out by the magnet. A coil of copper wire is wrapped around the far end of the cylinder, all of which is fitted into a housing. At the far end of the wire is a needle, steadied on either side by a spring. Behind the needle is the dial representing voltage. Fitted on the outside of the housing are two more wires, each of which connects to either end of the magnet.

    How Does a Voltage Meter Work?

    • When the voltage meter is at rest, the needle points to the left side of the meter, representing zero electrical potential. The wire leads are attached to two parts of a live circuit. This causes the electricity to polarize the magnet within the meter even further. Should the difference of the potential between the two wires be a positive number, which it would be if any electricity were flowing through the circuit at all, the magnetic field within the meter becomes positively imbalanced, causing the needle to pull from the left side of the meter to the right, indicating how strong the electrical potential is.

Products

VELLEMAN DVM850BL 3 1/2 DMM

Suppliers: VELLEMAN
Type: Digital
HOLD FUNCTION
LCD Backlight
Features* DMM with automatic polarity function and 3 ½ digit LCD display
* measurements: DC current up to 10A, AC and DC voltage up to 600V, resistance up to 2Mohm
* diode, transistor and continuity test with buzzer
* data-hold function and backlight
* with protection holster

Specifications

* DC voltage: 200m/2/20/200/1000V
o basic accuracy: –
o input impedance: –
o maximum input: 600V
* AC voltage: 200/600
o basic accuracy: –
o input impedance: –
o frequency range: –
o maximum input: 600V
* DC current: 200µ/2m/20m/200m/10A
o basic accuracy: –
o overload protection: 10A
* AC current: –
o basic accuracy: –
o overload protection: –
* resistance: 200/2k/20k/200k/2M
o basic accuracy: –
o overload protection: –
* capacitance: –
o accuracy: –
* inductance: –
o accuracy: –
* frequency: –
o basic accuracy: –
o overload protection: –
* temperature: –
o basic accuracy: –
* overrange: yes “1”
* continuity buzzer: yes
* transistor test: yes
* diode test: yes
* low-battery indication: –
* maximum display: 1999
* LCD display size: 1.8″ x 0.7″
* ranging mode: manual
* data hold: yes
* backlight: yes
* dimensions: 2.7″ x 5.4″ x 1.2″
* weight (with battery): 13.2275 oz
* power supply: 1 9V 6LR61 battery (incl.)
* packing: –
* accessories: –
* auto power-off: no

VELLEMAN VTTEST8 LAMP CHECKER

Brand VELLEMAN
Model VTTEST8
Specifications
Power Supply 9V battery (included)
Features
Features
  • for lamps with one of the following fittings: G13, B15d/G5, G4/GU5.3/GY6.35, E27, E14, E10
  • “beep”-signal confirms that lamp functions normally

VELLEMAN VTTESTL LED TESTER

Brand VELLEMAN
Model VTTESTL
Specifications
Normal LED test range between 2-30mA
All others test range between 20 and 150mA
Power Supply 9V battery (6F22SC, included)
Dimensions 0.26″ x 0.18″ x 0.06″
Weight 2.82oz
Features
Features
  • handy, versatile and portable LED tester
  • types of LED:
    • normal LED
    • bi-colour LED (CA and CC)
    • superflux (spider) LED

VELLEMAN VTTEST2 DIGITAL VOLTAGE TESTER – WITH LCD

Brand VELLEMAN
Model VTTEST2
Specifications
Specifications
  • voltage tester (AC or DC) between 12V and 220V
  • grounding test and testing of broken lines
  • with LCD
  • size: 0.44ft
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Computer Cases 101

eiodotcom —  October 2, 2012 — Leave a comment

Today’s EIO post is an introduction to computer cases and their uses.

 

What Is A Computer Case?

 

 

 

A computer case (also known as a “computer chassis”, “cabinet”, “box”, “enclosure”, “housing”, or simply “case”) is the enclosure that contains most of the components of a computer (usually excluding the display, keyboard and mouse).  Cases are usually constructed from steel (often SECC — Steel, electrogalvanized, cold-rolled, coil) or aluminium. Plastic is sometimes used, and other materials such as wood and even Lego blocks have appeared in home-built cases.

 

Design

 

Computer cases usually include sheet metal enclosures for a power supply unit and drive bays, as well as a rear panel that can accommodate peripheral connectors protruding from the motherboard and expansion slots. Most cases also have a power button or switch, a reset button, and LEDs to indicate power status as well as hard drive and network activity. Some cases include built-in I/O ports (such as USB and headphone ports) on the front of the case. Such a case will also include the wires needed to connect these ports, switches and indicators to the motherboard.

 

Hardware Access

 

Tower cases have either a single side panel which may be removed in order to access the internal components or a large cover that saddles the chassis. Traditionally, most computer cases required computer case screws to hold components and panels in place (i.e. motherboard, PSU, drives, and expansion cards). Recently  there is a trend toward “screwless” cases, in which components are held together with snap-in plastic rails, thumbscrews, and other methods that do not require tools; this facilitates quick assembly and modification of computer hardware.

 

 

Products

 

 

APEVIA X-CRUISER-AL Silver Steel ATX Mid Tower Computer Case

 

ATX Mid Tower
Front Temp, Sound, Fan Speed Gauges
Front 2 x USB 2.0, 1 x Firewire, 2 x audio
Model
Brand APEVIA
Model X-CRUISER-AL
Specifications
Type ATX Mid Tower
Color Silver
Case Material Steel
Power Supply No
Power Supply Mounted Top
Motherboard Compatibility Standard ATX / Baby AT / Micro ATX
Main Board Size: Fits up to 11″ x 12″
With Side Panel Window Yes
Expansion
External 5.25″ Drive Bays 4
External 3.5″ Drive Bays 2
Internal 3.5″ Drive Bays 4
Expansion Slots 7
Front Ports
Front/Top Ports 2 x USB 2.0, 1 x Firewire, 2 x audio
Cooling System
80mm Fans 2 x 80mm fan – front (optional)
1 x 80mm UV blue LED fan – top (included)
1 x 80mm UV blue LED fan – rear (included) upgradable to 120mm fan.
Side Air duct UV Air Duct and Filter on Side Window (Thermally Advantaged Chassis)
Physical Spec
Dimensions(L x W x H) 19.25″ x 7.75″ x 17.00″
Features
Features Modern Sophisticated Stylish Design
Large See-through Side Window
1 x UV Air Duct and Filter on Side Window (Thermally Advantaged Chassis)
1 x Front Fan Gauge w/ Fan Controller (Controls up to 5 fans)
1 x Front Temperature Gauge with Blue Back Lighting
1 x Front Volume Gauge and Volume Controller
Front Panel LED Lights

 

 

 

 

 

 

 

 

 

APEVIA MX-PLEASURE-BK Steel ATX Full Tower Computer Case

 

ATX Full Tower
500W Power Supply
Front Panel 2 x USB2.0, 1 x Firewire
Model
Brand APEVIA
Model MX-PLEASURE-BK
Specifications
Type ATX Full Tower
Color Black
Case Material Steel
Power Supply 500W
Power Supply Mounted Top
Motherboard Compatibility Standard ATX / Baby AT / Micro ATX
With Side Panel Window Yes
Expansion
External 5.25″ Drive Bays 4
External 3.5″ Drive Bays 2
Internal 3.5″ Drive Bays 7
Expansion Slots 7
Front Ports
Front Ports 2 x USB2.0, 1 x Firewire
Cooling System
80mm Fans 1 x 80mm UV blue LED fan – front
1 x 80mm UV blue fan – front
120mm Fans 1 x 120mm UV blue LED fan – side
1 x 120mm UV blue LED fan – rear
Physical Spec
Dimensions(L x W x H) 19.00″ x 8.00″ x 21.25″
Weight 31 lbs.
Features
Features Fully loaded steel durable chassis
Ideal for small business, network server
Lockable side panel and front panel
Fold in/out case feet for case stability
Front temperature display gauge
Front fan speed controller and gauge

 

 

 

 

 

 

 

 

Sentey SS1-2421 Slim 2421 Slim Flex Case w/Power Supply LCD DISPLAY SECC 0.7mm 2x USB/1x Fan/Micro ATX-ITX

 

SECC 0,7mm / Plastic MicroATX Slim Case
240 W Power Supply
Included LCD Display
Model
Brand Sentey
Series Slim Series
Model SS1-2421
Spec
Type MicroATX Slim Case
Color
Glossy Black
Case Material
SECC 0,7mm / Plastic
With Power Supply
Yes
Power Supply BCP450-OM 250 Watt Constant/450 Watt Peak
Power Supply Mounted
Top
PSU Main Connector 20+4Pin
Motherboard Compatibility
Micro ATX / ITX
With Side Panel Window
No
Expansion
External 5.25″ Drive Bays
1
External 3.5″ Drive Bays
1
Internal 3.5″ Drive Bays
1
Hot-Swap Drive Bays 1 Sliding Bays
Expansion Slots
4 Low Profile
With front LCD display
Yes
Front Ports
Front Ports
USB 2.0 x 2 , Audio & Mic
Cooling System
80mm Fans 1 x 80mm Top Fans
Physical Spec
Dimensions(L x W x H)
15.74″ x 4.09″ x 12.79″
Weight 9.50 lbs.
Features
Features
Included LCD Display

Supports Micro-ATX / ITX

Glossy Black Painting

Slim and compact design

Supports Low Profile Cards

Included Power Supply Sentey BCP450-OM

Today’s EIO post is on educational language software that can help you stay competitive in the expanding globalized workforce.

 

Why Is Language Education Practical And Needed

Increasing globalization has created a large need for people in the workforce who can communicate in multiple languages. The uses of common languages are in areas such as trade, tourism, international relations, technology, media, and science.  Hundreds of languages are available for self-study, from scores of publishers, for a range of costs, using a variety of methods. But here at EIO, we recommend going with computer software.

 

Why You Should Choose PC Software As Your Learning Method

Software can interact with the individual in ways that other learning methods cannot:
1. Software fits into your schedule and is accessible at any time you are in front of your computer.  It allows people to learn at their own pace and doesn’t have the inconvenience of being required to sit in a classroom or attend a lecture.

2. Some software records the learner, analyzes the pronunciation, and gives feedback. Learning from software is like getting individual tutoring from a teacher.  It’s all one-on-one instruction.

Take A Look At Some Of Our Products

 

TOPICS Entertainment Instant Immersion Spanish Levels 1,2 & 3

 

Spanish Levels 1-2 -3Windows/Mac
Model
Brand TOPICS Entertainment
Model 81122
Spec
Name Instant Immersion Spanish Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail
Feature
Features Spanish Levels 1-2 -3 (v.2) Windows/Mac The Complete Language Learning System – Instant Immersion uses natural image association techniques to help you learn as easily as you learned your first language. With Instant Immersion, you will have more fun, save money and reach your goals faster. Contains 6 Language Learning CD ROMs + 3 Bonus Discs (Interactive DVD, Audio MP3 CD, “Who is Oscar Lake” game.) PC & Mac Compatible Minimum System Requirements: MAC OS X 10.3.9; Win XP/Vista, P4, 500 MHz, 512MB RAM, 1024 X 768 Color Display, Sound Card, CD ROM Drive

 

 

TOPICS Entertainment Instant Immersion English Levels 1-2-3

 

English Levels 1-2 -3
Windows/Mac
Model
Brand TOPICS Entertainment
Model 81124
Spec
Name Instant Immersion English Levels 1-2 -3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail

 

 

 

 

 

 

 


TOPICS Entertainment Instant Immersion German Levels 1,2 & 3

 

German Levels 1-2 -3
Windows/Mac
Model
Brand TOPICS Entertainment
Model 81126
Spec
Name Instant Immersion German Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail

 

 

 

 

 

 

 

TOPICS Entertainment Instant Immersion Japanese Levels 1,2 & 3

 

Japanese Levels 1-2 -3
Windows/Mac
Model
Brand TOPICS Entertainment
Model 81128
Spec
Name Instant Immersion Japanese Levels 1,2 & 3
Type Learning
Operating Systems Supported Windows & Mac OS
Packaging Retail

Laptop Cooling Fans 101

eiodotcom —  September 21, 2012 — Leave a comment

Today’s EIO post is an introduction to some of our laptop cooling products.

Is a Laptop Cooler Really Important?

One thing that any laptop owner should be aware of is the fact that all electronic devices generate a certain amount of energy… simply by being used.  This energy is then used and dispersed in the form of heat, which is the reason why your laptop may heat up from time to time.  Manufacturers are aware of this problem, and consequently build their products to withstand a certain threshold of temperatures.  In this sense, laptops are already equipped with cooling fans and vents throughout the device. But as is often the case, overheating may and often does occur.  Consequently, whether or not a customer should look into purchasing a cooling fan depends on the individual habits of that person, as well as how and under what circumstances they plan on using the product.

Factors That Cause Excessive Heat That May Harm Your Laptop

Surrounding Temperatures:

Laptops are usually designed to withstand temperatures of up to 50 degrees Celsius maximum.  If, for example, you live in an area that regularly exceeds this maximum temperature, the likelihood of your device experiencing problems would be quite high.  Heat often builds up and takes some time to disperse from the inner casing of a laptop.  So if your equipment was permanently in a location with high temperatures, it would be a good idea to have something to cool it off before serious damage is done to the product.

Customer Use:
Many times customers enjoy using their laptops in conditions other than sitting at a desk or a table.  The reason they purchased the product, after all, was for the sake of mobility and comfort.  What often happens, however, is that customers begin using their laptops on the bed, sofa, carpet flooring, and especially their laps, and inadvertently block off the cooling vents.  This prevents any cooling air from escaping from the laptop.

 

In this sense, if you want to experience the full joy of owning a laptop and maintain the luxury of using it wherever you choose, it may be a good idea to purchase a laptop cooling fan.

Products:

 

Macally ECOFAN Bamboo Cooling Stand

 

Brand MacAlly
Model ECOFAN
Spec
Type Docking Stations / Stands / Coolers
Features
Features Organic
Eco-friendly
Ultimate thermal solution

 

 

 

 

 

COOLER MASTER R9-NBC-2WAK-GP NotePal X1 Notebook Cooler

Brand Cooler Master
Model R9-NBC-2WAK-GP
Spec
Accessory Type Cooler
Specifications
Dimension (W / H / D): 14.37″ x 11.42″ x 2.13-2.76″
Fan Dimension (W / H / D): 4.72″ x 4.72″ x 0.98″
Bearing Type: Sleeve
Fan Life Expectancy: 30,000 hours
USB Port: USB2.0/1.1 x 2
Weight: 1.61 lbs.
Safety: FCC / CE / C-tick
Fan Airflow: 23 ~ 44 CFM
Rated Voltage: 5 VDC
Features
Features
Stylish design Large metal mesh surface for great cooling performance

Perfect wrist-resting position allows users to work at ease

Fan speed control

Convenient usage on the knee

Better airflow with ventilation at bottom

Ergonomic design provides perfect viewing angle

Two different height settings

Four anti-slip rubbers prevents the notebook from sliding

Convenient usage anywhere

 

 

 

 

 

 

SIIG AC-CL0112-S1 Swivel and Tilt Notebook Cooler

Brand SIIG
Model AC-CL0112-S1
Specifications
Type Cooler
Specifications Fan speed: 2000 RPM
Air flow: 19 CFM
Noise: 21.26 dBA
Operating current: 0.14A

System Requirements
Notebook computer with an available USB port

Features
Features
  • Fits 11″ – 15.4″ notebooks
  • Ultra silent fan
  • 360 degree swivel base
  • Ergonomic adjustable tilt
  • USB powered – no additional external power needed
  • Extends notebook’s life by lowering its operating temperature
  • Protects your lap and prevents heat damage to your furniture
  • 6 level adjustable tilt, from 20 – 50 degrees

 

 

 

 

 

 

Thermaltake CLN0008 Thermaltake Massive23 CS Notebook Cooling Stand

Brand Thermaltake
Model CLN0008
Spec
Accessory Type Cooler
Specifications
Dimension: 360(L) x 319(W) x 52(H) mm
Heatsink Material: Aluminum
Fan Dimension: Ø 200×20 mm
Rated Voltage: 5 V
Rated Current: 0.22 A
Started Voltage: 3.5 V
Fan Speed: 600±200 R.P.M.
Max. Air Flow: 57 CFM
Max. Air Pressure : 0.37 mmH2O
Noise: 17 dBA
Accessory: USB to DC Cable
Weight: 3.55 lbs. (1.61Kg)
Features
Features Embedded ultra silent 23cm variable color LED Fan with On/Off switch.

Intakes massive cold airflow for best cooling effect

Aluminum material with black stylish design

Great combination of ergonomic and anti-slip design with versatile angle for optimal operating comfort.

Supports laptop dimensions 10″ ~ 17″, especially for wide-screen laptop.

 

Today’s EIO post is on magnifiers.

 

Benefits of Magnifiers

Magnifiers are great because they help to enhance vision. They enable people to undertake detailed work or compensate for a sight disability that lowers an individual’s vision. Magnifiers are valuable when one most focus on fine detail. In hobbies such as model-making, stamp collecting and cross-stitch, an individual will often use a magnifier so they can see intricate detail.

Magnifiers have specially designed lenses that bend light. This increases the size of text or a smaller object, making it better to see. To get the best focus on the task in hand, hold the magnifier close to the your eye. Then bring the work up towards it till optimal focus is achieved.

When carrying out intricate tasks with a magnifier, one should work in the natural light as much as possible to avoid straining the eyes. Where it is not possible to work with natural light, or where natural light isn’t adequate, utilize an adjustable light fixture. This allows light to shine directly on to the area being magnified.

Different magnifiers should be used for different tasks. Larger lenses tend to be less powerful than smallish lenses. Large lenses are useful when an individual wants all-round, low-level magnification. Large lenses work effectively for tasks like reading or completing a crossword. Where precision work is needed, a small powerful lens may very well be more appropriate. A good example of a smaller, powerful magnifier would be jeweler’s magnifier.

Handheld magnifiers are easy to use and cheap to buy. Some handheld magnifiers have built-in illumination, making it easier to see when the lighting is poor. These magnifiers are well suited for reading small print while active because they are light to transport. The disadvantage of some handheld magnifiers is that they leave the individual with merely one hand available to carry out tasks. This is fine if the individual is only holding a book, newspaper, and also magazine, but this may be restrictive.

Hands-free magnifiers are probably a better option for anyone with a hobby that demands the use of their hands, such like sewing, knitting, or model-making. Hands-free magnifiers hang around the individual’s neck. This is great for other assignments too, as they have large lenses. This version of hands-free magnifier offers small magnification, usually only doubling the size of any object.

 

Dailyburn

VELLEMAN VTLAMP2BNU LAMP WITH MAGNIFYING GLASS 5 DIOPTRE – 22W – BLACK
Model
Brand VELLEMAN
Model VTLAMP2BNU
Specifications
Dimensions
  • arm length: 41 11/32″
  • width: 9 29/64″
  • height: 2 23/64″
Color Black
Power Supply 110Vac
Spare Lamp LAMP22
Features
Features This magnifying lamp is designed as an aid for all kinds of precision applications from health care to precision engineering. It’s also ideal for home applications. It comes with a 5-dioptre lens (magnification 2.25 x). A well-balanced, universally jointed arm makes for maximum adjustment. Light is provided by a circular fluorescent tube of 22W that encircles the glass. Mount the device on a table with the clamp.
VELLEMAN VTMG13 HEADBAND MAGNIFIER

Model
Brand VELLEMAN
Model VTMG13
Spec
Type Headband Magnifier
Specifications
  • multiplying power of lens: 1.5x, 3x, 8.5x, 10x
  • material of lens: acrylic resin (protected by crack-proof rigid coating)
  • size of lens : 89mm x 29mm (3.5″x 1.14″)
  • single lens diameter: 29mm (1.14″)
  • power supply: 2 x “AAA” batteries (LR03, not incl.)
  • weight: 148g (5.2oz)
Features
Features
  • adjust the angle of the light box upward or downward freely
  • you can also push the pivot left and right to adjust the LED light source
  • with detachable light source box and two “AAA” batteries
VELLEMAN VTMG6 HEAD MAGNIFYING GLASS WITH LIGHT

Model
Brand Velleman
Model VTMG6
Features
Features
  • head magnifying glass with dual light
  • magnifying glass with adjustable dioptry: 1.8 / 2.3 / 3.7 / 4.8 by making a combination of the glasses
  • power supply: 4 1.5V AA batteries (not incl.)
  • dimensions: 7.9″ x 2.4″ x 5.5″
  • weight: 5.3oz

Submersible Flashlights

eiodotcom —  September 11, 2012 — Leave a comment

Today’s EIO post is on Submersible Flashlights.

Products by Pelican

Submersible flashlights are manufactured to be stronger and more durable than your average flashlight.  They are especially useful when operating under the conditions of inclement weather. Because they are designed to be used under harsh circumstances, they are often made to give off a more piercing and brighter light emission as well, which allows the light to be seen through water, fog, rain and even smoke.  The following products are manufactured by Pelican Products and available for purchase on our website:

Pelican 1900C

CANDLEPOWER: 6,000 CP
SUBMERSIBLE to 500 Feet
The Mitylite™ is made of unbreakable space age polycarbonate resin and is 4-3/4″ (11.3 cm) in length. Its laser spot Xenon® lamp module can cut through water, smoke, fog, and rain making it a perfect light source for all applications. The MityLite™ is compact, light weight and equipped with a shirt clip, making it easy to fit into pockets, purses, tool kits, camera bags, or glove compartments. Accidental turn on and mechanical switch failure is eliminated because of the rotary on/off switch.
Pelican 2140C

CANDLEPOWER: 6,000 CP

SUBMERSIBLE to 500 Feet

Tracker™ is a handy pocket flashlight of 3-1/2″ (9 cm) in length which attaches to almost anything making it an ideal hands free flashlight. The Tracker™ easily fits into tool/fishing boxes, photographer’s equipment, travel bags and is perfect for any outdoor activity, scuba diving, home, office or emergency lighting. Submersible to 500 feet, the Tracker™ is ideal for anyone to use as a warning or emergency light. It includes 2-AAA cell Alkaline batteries and is CENELEC approved.

Pelican 2130C

CANDLEPOWER: 4,000 CP

SUBMERSIBLE to 500 Feet

The Mini Flasher keeps track of joggers, hikers, children, pets and can identify equipment and campsites at night. The flashing LED lamp produces a light so powerful that is visible up to a .50 mile (800 m) for 130 hours. Submersible to 500 feet (150 meters), the Mini Flasher is ideal for anyone to use as a warning or emergency light. This small .068 lbs. (.030 kg) flashlight includes a heavy-duty clip and ring, which can attach to anything, making the Mini Flasher easy to pack or carry when not in use.

LED’s: LED Displays

eiodotcom —  September 8, 2012 — Leave a comment

Today’s EIO post is on Light-Emitting Diode (LED) Displays.

LED

If you are uncertain about the basic qualities and uses of LED’s, please refer to this earlier post providing a basic summation.

7-Segment LED Displays

Seven segment LED displays are the most basic representational format used to create an electronic image or representation.  They are composed of seven congruent parts, which can be manipulated to create the Arabic numerals (0-9) as well as the six letter digits (A-F).  The most common uses for seven segment displays are for posters, electronic telephone number displays, and pricing displays. Seven segment displays are no longer used as frequently as they were in the past, due to the fact that dot-matrix displays are now the common display method utilized to take full advantage of LED capabilities.

QT Optoelectronics MAN6460 Single Digit LED Display

Dot Matrix Displays

Dot matrix displays are now the most common form used to create images and representations with LED’s.  Dot matrices consist of a 2-D matrix of LED’s.  Through the flow of electricity, it is possible to control each LED individually, which allows for the creation of different objects and symbols.

Sure Electronics DE-DP11212 P7.62 24X16 Red LED Dot Matrix Unit Board