Seeeduino Mega - Microcontroller Derived Arduino Mega - Compatible with Most Arduino Duemilanove and Diecimila Shields - Arduino compatible, based on Seeeduino - Onboard microcontroller: ATmega328P - Onboard Real Time Clock chip with a supercap as a backup power source - Serial interface with DTR for auto reset during programming when operating in standalone mode. (For programming, UartSBee must be bought separately) - MicroSD card socket - I2C Pin header (operation voltage is selectable: 5.0V or 3.3V) - User defined switch and LED - Bee series socket - 2*10 pin 2.0mm pitch (which will mate with - one at a time - any of the wireless modules: XBee, BluetoothBee, GPSBee or RFBee.) - IO Ports work in 0~3.3v level only.