Fire alarm
Sends out a signal indicating the unwanted detection of fire. The alarm monitors the environmental changes associated with combustion. Once the alarm has been triggered by fire or smoke a loud sound emanates to warn of danger. A home fire alarm system can be part of a total security system which also provides burglary protection in addition to fire protection.

Flood detector
A device designed to detect the presence of water. Some flood detectors will send out an early warning alarm for leaky pipes, faulty water heaters, dishwashers and washing machines. Some detectors are sensitive enough to detect even the smallest amounts of moisture before mold, mildew and serious water damage or even flooding will occur.