Grab this Philips Hue Motion Sensor for Smart Lights for only $27 right now on Amazon, regularly $40! This will have your lights turn on and off when you enter/leave a room, helping to conserve energy and can also be used to dim lights for certain times during the day. This is a great price for something that can literally save you hundreds a year!

• The Philips Hue Smart Motion Sensor combines convenience and energy efficiency. Have your lights turn on when you walk into a room, and off when you leave. The Smart sensor detects optimum daylight levels to conserve energy during the day.
• During the night the Philips Hue Motion Sensor will switch to smart night light settings: a gentle, warm light setting to help you navigate during the night without disturbing your rest.
• The Philips Hue Motion Sensor can be placed freely for an optimal detection area, or mounted to a wall using screws (included). The device is battery powered, wireless and installation free (no re-wiring required) to control your lights without hassle.
• Place anywhere in your home including your hallway, bathroom, kitchen, and more. The integrated light sensor saves energy by detecting when rooms are vacant and automatically turning off lights
• Installed in a minute. Simply follow the instructions in the Philips Hue app. Our smart lights default settings get you going, or personalize these settings to fit your needs.
• The Philips Hue motion sensor requires a Philips Hue bridge to make it part of your smart home lighting system. The Philips Hue system can control up to 50 smart lights.
• When you use the Philips Hue motion sensor with a Philips Hue bridge, you can use it to control any HomeKit compatible appliance.

Philips Hue Motion Sensor for Smart Lights (Installation-Free, Smart Home, Exclusively for Philips Hue Smart Bulbs)