monitored burglar alarm
It is obvious what most sensors do, so we will only describe
the main ones used in a basic system. Contact Sensors: Most burglaries involve doors, either on entry or while
leaving the house. So protecting all doors is a must. Example: magnetic circuit breakers. Door contacts may be hardwired or wireless; hardwired contacts are usually buried in the doorframe, which is less obvious than wireless and are preferable. Window Contacts: Can be hardwired or wireless.