Description: control board for multi-rotor aircraft (Tricopters, Quadcopters, Hexcopters etc) so as to stabilize the aircraft during . High performance,easy and convenient to use. Updated to an incredibly sensitive 6050 MPU system making this the most stable KK board ever and allowing for the addition of an auto-level function. Uses signals from your radio systems receiver (Rx) and passes these signals to the Atmega644PA IC via the aileron, elevator, throttle and rudder inputs.Once this information has been processed the IC will send varying signals to the ESCs which in turn adjust the rotational speed of each motor to induce controlled (up, down, backwards, forwards, left, right, yaw). Size:Approx.51x51x12mm/2x2x0.47inch Specification: Built-in mode: Dualcopter Tricopter Y6 Quadcopter + Quadcopter X Hexcopter + Hexcopter X Octocopter + Octocopter X X8 + X8 X H8 H6 V8 V6 Aero 1S Aileron Aero 2S Aileron Flying Wing Singlecopter 2M 2S Singlecopter 1M 4S Size Chart: IC: Atmega644 PA Gyro/Acc: 6050MPU Inc. Auto-level: Yes Input Voltage: 4.8-6.0V AVR interface: standard 6 pin. Signal from Receiver: 1520us (5 channels) Signal to ESC: 1520us Firmware Version: V1.17S1 Package Includes: 1 Piece Controller Board : Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may 1-2 error in size.