Specification Brand : Adafruit BulletPoint1 : Multiplexed 4 digit 7-Segment Ultra Bright Display BulletPoint2 : I2C Backpack (Requires Soldering) that allows the display to be driven with just 4 pins! BulletPoint3 : Setup guide and Arduino libraries available from Adafruit BulletPoint4 : Luminous Intensity: 11mcd; Number Height: 0.55 inch; Panel Size: 19 x 12.7 x 8mm / 0.75" x 0.5" x 0.31" (L*W*H); Total Size: 19 x 12.7 x 14mm / 0.75" x 0.5" x 0.55" (L*W*H) BulletPoint5 : Material: Plastic, Metal; Color: Black, White; Package Content: 10 x LED Digital Display Tube;Notice: It is recommended to use constant current not constant voltage, constant voltage will cause uneven brightness. Color : Blue CompatibleDevices : [POSSIBLE_DEVICES_WITH_GPIO_OR_51_MICROCONTROLLERS] ConnectivityTechnology : i2c ControlMethod : application CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 701851951809 ExternallyAssignedProductIdentifier2 : 0701851951809 FinishType : Metallic HardwareInterface : usb IncludedComponents : 2x MAX7219 32x8 LED Matrix 4-in-1 Module (Green), 2x 20CM Dupont line 5Pin (2 colors random) ItemName : Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack - Blue [ADA881] ItemPackageDimensions_Height : 1.524 centimeters ItemPackageDimensions_Length : 3.302 centimeters ItemPackageDimensions_Width : 4.826 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : led-segment-displays Manufacturer : Adafruit Material : copper Material1 : plastic Material2 : metal ModelName : ADA881 ModelNumber : 881 NumberOfItems : 10 NumberOfPieces : 10 PartNumber : ADA881 ProductDescription : What's better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8x8 matrix or a 4-digit 7-segment display. Matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these adorable LED matrix backpacks come in. We have them in two flavors - a mini 8x8 and a 4-digit 0.56" 7-segment. They work perfectly with the matrices we stock in the Adafruit shop and make adding a bright little display trivial. The product kit comes with: A fully tested and assembled LED backpack Ultra-bright 4-digit 0.56" tall seven-segment display 4-pin header A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes. Of course, in classic Adafruit fashion, we also have a detailed tutorial showing you how to solder, wire and control the display. We even wrote a very nice library for the backpacks so you can get running in under half an hour, displaying images on the matrix or numbers on the 7-segment. If you've been eyeing matrix displays but hesitated because of the complexity, this is the solution you've been looking for! ProductSiteLaunchDate : 2015-03-12T11:36:33.639Z RealAngleOfView : 178 degrees ScreenSurfaceDescription : Glossy SeriesNumber : 881 Size : 10 Count (Pack of 1) Style : industrial SupplierDeclaredDgHzRegulation : unknown SurfaceRecommendation1 : Metal SurfaceRecommendation2 : Plastic TotalHdmiPorts : 1 UnitCount : 10 UnspscCode : 53121603 Voltage : 5 volts Wattage : 36 milliwatts