DROK 9V 1A (1000mA) US Plug Power Adapter + UNO R3 Atmega328p Atmega16u2 Development Board with USB Cable for Arduino Compatible With Arduino UNO R3 Mega 2560 Nano Robot The UNO R3 development board use ATmega328P ATmega16U2 microcontroller. Compatible with Arduino UNO R3 Mega 2560 Nano robot. Use 8 high-speed Schottky diodes at output as protection; stack design can be directly plugged into the Arduino. AC 100-240V 50/60HZ input, 9V 1000mA (1A) DC output power adapter (US plug). Package includes: 9V 1A Power Adapter, UNO R3 development board, USB Cable.