Adafruit NeoTrellis RGB Driver PCB (3954) for 4 x 4 keypad is NeoPixel supported and comes with multiple color options under the rubbery button pads. This button pad board is fully tile-able and communicates over I2C. With 5 address pins, there is an ability to connect up to 32 together in any arrangement. This board/chip uses I2C 7-bit addresses between 0x2E to 0x4D, selectable by soldering jumpers on the back of the board. The Adafruit NeoTrellis RGB Driver PCB features 60mm x 60mm x 4mm dimensions.