New BRAND: Heavy Duty Compact Size BEE SMART Automatic Water Level controller MODEL: BEEWLC-4 Auto On, Auto Off , No Dry run protection Supply voltage : 190-250 V AC, Suitable up to 0.5 / 1.0/1.5 HP Motor Mono Block pump & Sump Pump. Warranty:1 Year Replacement.Package contains: Automatic Water level controller 1 unit, and User manual , Sensor 3 nos S.S316 .Working : Install the water level controller .connect the INPUT OUT PUT . As shown in the User Manual There are out of three sensors, Green sensor put at the bottom, Black sensor put at middle, and Red sensor at top level of the tank. When the water level in the tank becomes low, means water get down from middle sensor, motor get switch on automatically. The tank starts filling up. when the water level reaches to the middle Level Water LED ON. when the water level reaches to the higher level, the top level sensor sense. The motor automatically gets switched off. Also LED Indicator power on,50% water & and motor on .