The Fibaro Motion Sensor measures the temperature, movements, light intensity, and acceleration in the room. You'll receive all measured data on your smartphone via the app. If something is detected, you'll get a push notification on your phone. At home, the color of the blue ball switches to the pre-programmed color. Link a certain color to a temperature range, and you can see what the indoor temperature is at a glance. Thanks to the different readings, you can control the entire room with 1 sensor. The 4.6-cm diameter makes this motion detector very compact. That means it's easy to hold, and it won't stand out in the room it's in. In order to use the smart functionalities, you do need a Z-wave Plus base station, such as the Homey base station.
Note: the Fibaro motion detector isn't compatible with Apple HomeKit.