KLS-N is high performance series. It can handle longer high current. (2 minute standard, other kelly controllers are 1 minute to 20 sec depending on models). This controller is supposed to reduce the noise of BLDC motor,especially for hub motor.The BLDC motor must be based on 3 hall sensors.Customers can program the KLS controller on PC software or Android App.You may need a Z-TEK USB to RS232 cable for programming the controller if you want to program the controller on PC and Android Tablet. High efficiency controller, high continuous current, low cost. IP66 rated waterproof controller by default.