Can be operated as Automatic&manual.

In the Automatic the motor is switched on automatically before your tank becomes empty and will be switched off automatically before it over flows.

Semi Automatic Mode

It can also be operated as Semi Automatic. In this Mode The Motor pump can be switched on at any time using the restart switch, and the motor will be switched on at any time using the restart switch, and the motor will be switched off automatically when the tank is full.