Wireless alarm
Most residences, facilities, and vehicles have installed security alarm systems to monitor the properties from burglars and accidents. Security systems for protecting of property, in particular homes, have become quite common as well as the monitoring of such systems by a central monitoring service. A security alarm system, such as burglary alarm system, generally comprises a control system to control a plurality of security devices, such as motion detectors, window sensors, opening contacts, and alert devices including communication devices such as voice dialer or digital dialer and audible and visual alarm devices for providing local alarm when burglar breaks in the protection area. Initially, these security systems were hard wired systems where the various sensors and data entry keypads were hardwired to a control panel. Remote wireless alarm systems have proven extremely useful in a variety of applications. Generally, such systems include a transmitter connected to monitor a condition and a receiver for notifying the carrier thereof of the monitored change in condition. Such systems are generally useful wherever a person who moves around a lot must be quickly notified of the change or existence of a given condition. Many wireless alarm systems include a digital communication module which when activated transmits digital signals which may be enhanced by transponders and then transmitted by radio signals to a central station, the police or other security personnel. Most radio frequency (RF) wireless security systems available today employ a multiplicity of transmitters in communication with a central receiver control unit. The information transmitted typically describes the state of various transducers or sensors associated with each transmitter, such as smoke, motion, breaking glass, shock and vibration detectors.
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