snapdeal is selling Hilex Water Overflow Alarm at Rs 165 [ 67 % off ]
https://www.snapdeal.com/product/hilex-water-tank-talking-alarm/1420261588
MRP Rs 500
"Now control the water and electricity wastage caused by excessive overflows of the tank at homes, or factories.
prompt you the moment tank starts overflowing.
comes in a small stylish iron casing of square shape taking the sturdiness level an all new high.
The talking alarm comes with long wire and white coloured body.
Get notified when ever your tank is filled with a human voice alarm reminding you to switch the motor off."
Snapdeal Gold" qualifies for Free Shipping
Price comparison
Rs.230 @ ebay
http://www.ebay.in/itm/161385259382
Rs.260 @ amazon
http://www.amazon.in/HILEX-WATER-OVERFLOW-TALKING-ALARM/dp/B00QAHAXTU