• Requires a 5V supply• Constant current drivers for ultra-bright, consistent colour•1/16 step display dimming•I2C interface• Backpack comes with address-selection jumpers so you can connect up to eight 1.2" 8x 8's together (or a combination, such as four 1.2" 8x 8's & four 7-segments, etc) on a single I2C bus. What's better than a single LED? Lots of LEDs! But adding an LED matrix can mean a lot of wiring & space. This little kit makes the whole thing simple & tidy! The product kit comes with:A fully tested & assembled LED backpack 1.2" Ultra-bright 8x 8 matrix 4-pin header Adafruit have even provided a tutorial showing how to solder, wire & control the display & click here for the library to help you get started!