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In one complant I read the tech. Got caught stealing some items in a home nothing was done to fix it. Moni. Techs. You can trust very well trained and do a great job. Check your alarm company out before u hace them installed you might just find something they forgot to tell u.

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Commonvoltages are 6v, 12v, and 24v DC with 12v DC being the most common. Some 120v AC units have the capability to interconnect so that when one unitactivates, it causes the audible alarm in the other units to sound. Units canalso be purchased that have a relay output for connection to any security systemcontrol panel or wireless transmitter. The most common types available inhardware stores operate as independent sensors that are battery powered, are notconnected to the security system, and have their own audible alarm sounder. Heatsensors operate using a different technology from smoke detectors. The basicdesign features of each type are summarized in the following paragraph.