Mega ADK is such a controller based on Android devices, its size is extremely small, MEGA ADK and Google ADK. The Mega ADK can be developed using Google's ADK and can run on Android 2.3.4 or Android 3.1. A large 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. EXCELLENT 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 products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.