Product description Warranty service: fully automatic water level controller for tank this model will automatically switch on and automatically switch off the motor. Has auto on and auto off operation. auto on occurs when the tank level is low. Auto off when tank is full. Suitable for motor pump upto 1.5 Hp operated by a normal on/off switch / MCB. also suitable for electronic starter. In auto mode, auto on and auto off operation occurs. in manual mode, the motor pump will be constantly running. this controller unit has a fully automatic function (manual on and auto off function). Just keep the controller in manual mode for the motor to get switched on and then change it to auto mode for automatic off. long life. Easy to install. Advanced embedded technology.