KEYESTUDIO Super UNO R3 Board for Arduino +USB Cable MAIN CHIP: ATMEGA 16U2, ATMEGA 328PATMEL original, a upgraded UNO R3 that 100% Compatible to Arduino and works with the software at arduino.cc USER FRIENDLY: include a 3.3v and 5v switch, efficient DC-DC converter allow it powered of higher voltage power sources(7-20V), current up to 1000MA to directly drive the servos or small motors EXPANSION SLOTS : extra 4 I2C pins and an extra serial I/O pins allow you to connect to multiple input/output devices such as bluetooth and other I2C communication module COOL YELLOW-BLACK DESIGN: the yellow silk screen on black mask make it easy to read the pin labels, solder is very clean, everything is aligned nicely EXCELLENT QUALITY: they are made form environmentally friendly technology and materials, made function,voltage, current testing before packaging, must be really safe for adults and kids