Product name:40A Speed Controller Brushless ESC Drone Helicopter FPV Parts Multicopters Durable Components RC Toys Quadcopter Accessories as shown 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. Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection. User programmable. Compatible with Lipo and NiMH battery. Timing can be changed to suit for different brushless motors. Multiple procedure methods support: transmitter stick, LED procedure Card. Very easy to procedure at home or in flying field. . Specification Product Name: Brushless ESC Color: as shown Types: long, short Size: (approx) 68x25x8mm Current: 40A Output capacity: continuous current 40A, short-time current 55A (not less than 10 seconds) Power input: 2-4 lithium batteries(Not Included) BEC output: 5V@3A (linear regulator mode - linear mode) Maximum speed: 210,000 RPM for 2-pole motor, 7000 RPM for 6-pole motor, 35,000 RPM for 12-pole motor Packing list: 1*Brushless ESC