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: 30A Max Burst Current: 40A (≥10S) Input: 5.6-12.6V (2-3 Cells Lithium Battery Pack / 5-10 Cells Ni-MH or nickel-cadmium Battery Pack) BEC Output: 2A (Linear Mode) Max Rotating Speed: 210000rpm (2 Poles Motor), 70000rpm (6 Poles Motor), 35000rpm (12 Poles Motor) Size: 45 * 24 * 11mm / 1.8 * 0.9 * 0.4inch Package Weight: Approx. 34g Type: RC Accessory Package Include: 1 x Electronic Speed Controller