1、Safe power-on function ensures throttle lever in any position will not start the motor immediately to avoid personal injury 2、Automatic throttle range calibration can improve the linearity of throttle response 3、Can set undervoltage protection program to make the electronic speed controller reduce the output power automatically when the battery voltage is lower than protective threshold 4、Auto overvoltage protection will not start when the input voltage exceeds allowable input 5、Built-in temperature detection circuit will automatically reduce the output power if the temperature is too high for overheating protection Features: Safe power-on function ensures throttle lever in any position will not start the motor immediately to avoid personal injury. Automatic throttle range calibration can improve the linearity of throttle response. Can set undervoltage protection program to make the electronic speed controller reduce the output power automatically when the battery voltage is lower than protective threshold. Auto overvoltage protection will not start when the input voltage exceeds allowable input. Built-in temperature detection circuit will automatically reduce the output power if the temperature is too high for overheating protection. Remote signal loss protection will lower power when the remote signal loss for 1s and shutdown output for 2s. Specifications: Color: As Pictures Constant Current: 40A Max Burst Current: 55A (≥10S) Battery Input: 2-4cells Lipo / 5-9 cells Ni-mh or Nickel-cadmium BEC Output: 5V@3A (Linear Mode) Refresh Rate: 50-432Hz Max Rotating Speed: 210000rpm (2 Poles Motor), 70000rpm (6 Poles Motor), 35000rpm (12 Poles Motor) Size: 70 * 26 * 8mm / 3 * 1 * 0.3inch Package Weight: Approx. 44g Type: RC Accessory Program Setting Item: Brake Setting: Yes / No Battery Type: Lithium Battery / Ni-mh Low Voltage Protection Mode: Soft Shutdown / Hard Shutdown Low Voltage Protection Threshold Value: Low / Medium / High Start Mode: Normal / Soft / Super Soft Entrance Angle: Low / Medium / High Restore Factory Defaults Package Include: 1 x Electronic Speed Controller