Smraza Uno R3 Board (Blue) UNO R3 board,100% Compatible with the official version. Microcontroller board based on the ATmega328. Upgrading from 8U2 to 16U2, ATmega16U2 provides faster transfer rate and more memory. Digital I/O Pins: 14, PWM Digital I/O Pins: 6, Analog Input Pins: 6 and 16 MHz crystal oscillator. Package Including:1 x Compatible Arduino UNO R3 Development Board + 1 x USB Cable.