The Philips Hue Motion Sensor switches on your Philips Hue lamps when you walk past the sensor. You can connect the sensor to the Hue bridge via the Hue app. Because the sensor runs on 2 AAA batteries, you won't need a socket anymore. You can place it on a shelve or table, or you can mount it to the wall by using the included screw. The lamps will automatically switch on when you walk past the sensor. That's useful for in the bathroom, basement, or garage, for example. The light will also automatically switch off again once the sensor no longer detects movement.