ADK is such a controller based on Android devices, size is extremely small, ADK and Google ADK. The ADK can be developed using Google's ADK and can run on Android 2.3.4 or Android 3.1. A number of sensors and application modules can be connected, such as Hall sensors, button modules, thermistors, accelerometers, LDRs, potentiometers, touch sensors, joystick sensors and MOSFET modules, etc. QUALITY: High quality material, safe and durable. Controller: ATmega2560 Working voltage: 5V Input voltage: 7-12V Limit voltage: 6-15V Digital ports: 54 (including 14 PWM outputs) Analog port: 16 IO port output current: 40 mA 3.3V power supply output current: 100 mA Flash: 256 KB of which 8 KB used by bootloader SRAM: 8KB EEPROM: 4KB Crystal: 16 MHz Material: PCB colour: blue Package Contents: 1 x Development Board 1 x USB Cable Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.