Water damage is the most common and most costly disasters affecting North American residences. The average cost of repairs following water damage is $3000-5000, with some repairs costing more then 50,000. Water damage is the most frequent claim to insurance companies.Water damage can be caused by: leaky roofs, appliances, burst pipes, sewer backup, heavy rainfall, overland flooding, or rapidly melting snow and ice. Leaks can go undetected for hours or even days.This system eliminates the need for costly and recurring monthly monitoring fees, the system calls you. A water detector, connected to a telephone system may be able to provide advance notice of a problem and may help reduce the damage that water can do.Set includes: 1 wireless water detector, 1 telephone dialer, batteries and all connections.Sensor detects water and sends wireless signal to telephone dialer for quick notification.Dialer stores and calls up to 5 different telephone numbers to advise of an alarm.Land telephone line (not cellular) and electricity are required for the telephone dialer. Detector operates on a 9V battery (included). Calls can be made to land phones, mobile phones or pagers. Local and long distance can be made by the dialer.