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Samsung SmartThings Motion Sensor
Best motion sensor
Small and inexpensive, this model provides a wide, 120-degree field of view and a 15-foot range, and it has an innovative, adjustable mount.
The Samsung SmartThings Motion Sensor stands out among the few Alexa-compatible sensors because its long range lets it easily cover a large room (or even two), it can trigger in reaction to temperature as well as motion, and it’s super easy to pair with an Echo Plus or Echo Show (no SmartThings hub needed), so you can run Alexa Routines based on motion or temperature changes in the room. It’s a breeze to install, and thanks to a magnetic mount that’s easy to adjust, it fits almost anywhere you need it. The sensor is also water resistant (although it’s recommended only for indoor use).
Samsung SmartThings Multipurpose Sensor
Best contact sensor
This tri-purpose model triggers Alexa Routines based on contact, temperature, or vibration. Its rounded housing is stylish, and as it’s the smallest contact sensor we tested, it can easily blend in with doors and windows.
At a typical price of just $20, the tiny Samsung SmartThings Multipurpose Sensor (Zigbee) does a lot for very little. Its main purpose is to serve as a contact sensor, and you can easily stick one of these on any door, window, or drawer to detect when they open or close. But it also has temperature and vibration sensors inside, so it can alert you—or act as a trigger for other smart devices—if a room or area is too hot or too cold. That makes it the most versatile sensor we tested: You can just as easily keep tabs on the doors and windows of a rental property as on a precious liquor cabinet.
Source: The NY Times
Keyword: The Best Smart Home Sensors for Alexa