Attach this Hive Window or Door Sensor to your frame and receive alerts if your home is compromised while you're out. With optional notifications which can be sent straight to your phone, laptop or tablet, this sensor is a new way of protecting your home, designed to reflect modern living. You will need the Hive Hub (unless you already have Hive Active Heating) in order to pair this sensor with your smart devices, and can simply attach the sensor to your window frame in two parts - it uses infrared technology to detect when they are being separated. Features and Benefits Optional alerts - With automatic notifications which can be turned off if you're at home. Infrared technology - Which detects movement as your door or window is opened. Easy installation - Simply use the adhesive pads to attach the corresponding sensors. Specifications Dimensions: H3.5 x W6.9cm Material: Plastic Colour: White