A sensor which detect the water level from out side the wall of domestic water tank ,with out dipping any wire inside the tank. The controller get the status from sensor and control a pump wirelessly over 500 meter. The battery operated controller and transmitter consume very low current in sleep mode. And drown few 15 to 45mAmp current for very short duration 3 to 5 second or less ,when wake-up and done there job and go to sleep. The sensor , controller & transmitter all are consuming very low power per day so the 2200mAh lithium ion battery last approximate 2 year, then need recharge.