You can control your connected lighting by app, from your smartwatch, by voice, and even by a good old-fashioned button, but Philips’ latest addition to Hue only cares when you’re around. The Hue Motion Sensor takes a hands-off approach to smart lighting, triggering scenes across any of Philips’ bulbs, lamps, or luminaires when you walk past, either for convenience, security, or both.
The hardware itself is a tiny white box with a domed motion sensor on the front. Above it is an ambient light sensor, while below there’s a status LED. Two AAA batteries come pre-installed; you’ll need a screwdriver to open the back panel in order to replace them, though Philips says they should last for 2-3 years of typical use.
Since it has a flat base you can use the Motion Sensor free-standing, but Philips also includes a small wall mount. That screws into the wall and then the Motion Sensor magnetically attaches; the back is curved, so that you can angle it in different directions. Unfortunately, it’s the mount not the sensor which is magnetic, so you can’t just stick it to a refrigerator door or some other metal surface.
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https://www.slashgear.com/philips-hue-motion-sensor-review-03458448/