Detailed Info is Here
Amateur Unmanned Aerial Vehicle
Skywalker platform
Ardupilot Avionics Package
1500W 520 line electronic Package
16MHz Atmega2560 processor
Built-in hardware failsafe that uses a separate circuit (multiplexer chip and ATMega328 processor) to transfer control from the RC system to the autopilot and back again
Dual-processor design with 32 MIPS of onboard power
256k Flash Program Memory, 8K SRAM, 4K EEPROM
40 digital input/outputs
Four dedicated serial ports
Dual 3.3V Regulator
Relay switch for cameras, lights or payloads
12-bit ADC
Built-in 16MB Data Logger (The Black Box).
Built-in FTDI, making the board native USB.
Dedicated Modem/OSD port.
I2C Port
Two user-programmable buttons (one momentary, the other slide).
10-Bit analog expansion ports.
Reset button.
4 voltage dividers
vibration resistance Invensense Gyros (Triple Axis).
3 DX330 Accelerometer.
AirSpeed sensor port
Absolute Bosch pressure sensor and temp for accurate altitude
MAVLink protocol