QWinOut DIY RC Drone Quadrocopter X4M360L Rahmen Kit:GPS + APM 2.8 Flight Control + Brushless Motor + Brushless ESC + GPS Folding Antenna Mount Holder Category_Propellers and the external definition socket

and the external definition socket is reserved

Model type: fixed-wing/glider/helicopter

it is optional part

Low Voltage Cutoff Protection Threshold (Cutoff Threshold): low / medium / high

QWinOut DIY RC Drone Quadrocopter X4M360L Rahmen Kit:GPS + APM 2.8 Flight Control + Brushless Motor + Brushless ESC + GPS Folding Antenna Mount Holder Category_Propellers and the external definition socketPackage include: 1xX4M360L frame 2x920KV CW Brushless Motor 2x920KV CCW Brushless Motor 4x30A Brushless ESC 2X8443 8. 4*4. 3" Carbon Fiber Propeller Self locking Props 1XMK KK Multi Copter Power Battery to 8 ESC Connection Board 1XAPM 2. 8 Flight control 1x6M GPS with Compass 1x5pcs 10cm Servo Receiver Extension Lead Wire Cable 1xGPS Folding Antenna Mount Holder 12x3. 5mm banana plug 1xDeans Style T Plug Male Connector Silicone Wire With 11. 5CM 14awg