Water over flow tank alarm with voice sound overflow - water alarms is an ideal equipment that is used to control the wastage of power & water - easy installations - no use of battery now for this product - alarm with a sweet voice that alerts you even if you are not near to the alarm' - indication and attn. Water tank is full or panni ki tanki bhar gayi hai indication through voice alarm output. - never gives electric shock due to dc uses :- this water level indicator can be used in houses;apartments;clinics;hotels;lodges;restaurents;educational institutions;hospitals;factories hostels etc how to use :- * once the lead is inter connected to the predetermined position in the tank;the plugged equipment may start the pump motor. Thereby;when the water reaches to the predetermined position the equipment give alarm to switch off the motor.