Hobbyking KK2.1HC Multi-Rotor Hard Case Flight Control Board With Remote Programmer Size: 55mm x 55mm x 19mm Updated to an incredibly sensitive 6050 MPU system Weight: 32g IC: Atmega644 PA Gyro/Acc: 6050MPU InvenSense 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 Dualcopter Tricopter Y6 Quadcopter + Quadcopter X Hexcopter + Hexcopter X Octocopter + Octocopter X X8 + X8 X H8 H6 V8 V6 Singlecopter 2M 2S Singlecopter 1M 4S