IC: Atmega644 PA Gyro/Acc: 6050MPU InvenSense Inc. Signal from Receiver: 1520us (5 channels) Signal to ESC: 1520us Firmware Version:A: V1.19S1 PRO S1: Pre-installed firmware. 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 (Custom Mix via the "Mixer Editor" option) The Mixer Editor allows you to adjust where and how much signal the motors receive from stick input and sensors. This allows you to create any configuration possible with up to 8 motors or servos. Signal to esc: 1520us. Signal from receiver: 1520us (5 channels). Avr interface: standard 6 pin. Input voltage: 4. 8-6. 0v. Auto-level: yes. Due to different batches, there may be differences in product appearance, The colors of buttons and other small parts , which not affect the use Colour:Green Material:PCB Package Contents: 3 x Flight Controller Board Kit Only the above package content, other products are not included. Note: Light reflection 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.