These tiny devices are smart-home helpers. They detect and alert you about motion, temperature, or open or closed doors and windows — and can tell other smart devices to act.

A motion sensor can be used for security, tasks, and recreation. Used correctly, it can form the foundation of your smart home system and change how you interact with your home.

Ikea's Tradfri Gateway Kit and Motion Sensor Kit blend the Swedish retailer's confounding instruction style with average smart-lighting abilities.

There are absolutely motion sensors that are meant to work outside. Many smart home doorbells and security cameras have built-in motion sensors that can connect to your smart lights.

Using motion detection and other triggers to activate, top-notch smart home sensors keep you informed about what’s going on at home, indoors and outdoors.

Finding the best HomeKit motion sensor grants some new abilities to Apple's Home app, and with Thread technology, this will "Matter" even more going forward.

The Lightify Smart Sensor is a good add-on for Sylvania smart bulbs, but the Hue sensor demonstrates why Philips leads the market.

Creating a smart home from scratch can be a daunting task. These are our favorite smart home devices available today, from ...

Read the full guide to smart home sensors for Alexa. Among Alexa's many tricks is that it also works as a smart-home hub.

I’ve tested a lot of HomeKit thermostats and Ecobee3 remains my top pick. It’s a Wi-Fi smart thermostat with remote sensors that detect both presence and temperature in individual rooms, and ...

Xiaomi launches Mijia Smart Dumbbells, starting at 99 yuan ($14), featuring motion sensors, LED display, app integration, and built-in fitness courses for smart workouts.