The SmartThings Motion sensor is a ZigBee device that lets you know when movement is detected in a certain area of your home and can trigger different actions in response to that movement. Set lights to turn on and off as you come and go and protect your home by triggering lights, sirens and other electronics to turn on if there's unexpected motion in your home. The sensor can also detect temperature and trigger smart thermostats, window A/C units and portable heaters to automatically adjust as people come and go.