Despite the name, the range covers not only movement but also doors and windows opening, water leaks, temperature, humidity and smoke. Tell a motion sensor apart from a presence sensor: the former reacts to movement and switches the light off on someone sitting still, while the latter notices a motionless person too. Battery-powered ZigBee sensors need a gateway to work, whereas Wi-Fi models join the router directly. The subsections divide the range into basic home sensors and detectors for alarm systems.
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