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These sensors detect infrared heat signatures and then send a wireless signal to alert a central alarm system, such as our JC-G02 (which can track up to 99 wireless sensors). This sensor does not emit an audible sound that can be heard.
This version has an internal style antenna, which is less obtrusive but at the cost of a slightly shorter range than an external antenna.
Use several of these sensors to establish "zones" of coverage, and your central alarm system will then alert you when a zone has activity -- you can then view the area if you have surveillance cameras established, or be alert to take other action.