Perry The Platypus Asked: How do wireless home alarm system work?

Like do they just cover part of the house or do they know every corner in the whole entire house? it says it protects you and your others, so how does it exactly work? I dont want to waste money If it not going to work all around the house


Paul in San Diego Answered:
A home alarm system has various detectors that monitor different things. For example, you have magnetic sensors on doors and windows (one part on the door/window and the other part on the jamb/frame) that, if separated by the door or window being opened, send out a signal indicating it's open. You also have infrared motion detectors that are located in specific places and calibrated such that they can detect motion in a certain part of a house (like in a foyer, a hallway, a living room, etc). And, smoke and carbon monoxide detectors can also be part of a home alarm system.

In a wired alarm system, each installed detector is hardwired to the main control panel. If the detector trips or the wire is cut, this indicates an alarm condition. In a wireless system, each detector is battery operated and, if the sensor trips or the battery goes dead, this indicates an alarm condition. The control unit in the home also has a battery backup such that, if the power gets cut off or the battery goes bad, this also indicates an alarm condition.

When an alarm condition is indicated, this causes an audible alarm to sound and, if this is a monitored system, an automated phone call is placed to the alarm monitoring company indicating what the alarm condition is. This phone call can be via landline or a cellular phone built into the alarm system. When the alarm is received at the monitoring company, they then call the home and asks whoever answers the phone if there is really an alarm condition occurring and they ask a secret security question as verification that it's not the bad guys who answered the phone.

If the alarm is false, the monitoring company doesn't do anything. If the alarm is real or nobody answers the phone, the monitoring company immediately calls either the police or fire department, as appropriate.

AVDADDY Answered:
Every installation is unique.

James Answered:
You need to buy enough sensors to adequately cover the areas you wish to protect.Make sure that the central processor can handle that number of units or more.Any sensor that is tripped sends a signal to the main unit.If it is armed, it sets off the alarm, and calls the monitoring station.Sensors also "report in" to the main unit on a regular basis, so that they can't "disappear" from the system.And they also report in to notify if their batteries are getting low.
The main package–central unit, keypad, siren and a few sensors–may be fairly inexpensive, but adding in all the additional sensors thatyour particular installation requires–door contacts, motion detectors, smoke detectors, etc–can add up pretty fast.

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