QWinOut 40A ESC 2-4S Brushless ESC Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 RC Helicopter Quadcopter DIY Drone Kit (4 Pcs,Short Cable)

Safety arming feature: Regardless the throttle stick position, the motor will not spin after battery connected.

Throttle calibration funtion: Throttle range can be calibrated to be compatible with different transmitters.

User programmable. Multiple procedure methods supported: transmitter stick, LED procedure Card. Very easy to procedure the ESC at home or at the flying field.

Compatible with Lipo and NiMH battery. Timing can be changed to be suitable for different brushless motors.

Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection.