Works perfect with official Arduino products; mistake-proof interface; uses customized wires. R G B control red green blue LED light respectively; it can produce different colors with different program; suitable for 51 / AVR / AVR / ARM / Arduino platform; 1. Working voltage: 4.5V~5.5V; 2. Can be cascaded; 3. Standard electronic building blocks interface a single signal line to control 4.4 x M2 screw positioning holes easy for installation; Specifications: Power supply voltage VCC: 4.5~5.5V; Input High VIH: 3.8~VCC V; Input Low VIH: GND~1.5V; Operating Current: 27mA A product for Arduino that works with official Arduino boards.