Magnetic window and door contact - opening sensor for Homematic IP This opening sensor is suitable both for smart integration via the CCU3 or Access Point central control unit and for directly linking with up to eight radiator thermostats. It consists of the electronic unit and a magnet contact. The usual service life with the two replaceable batteries is four years. Opening the monitored window causes the heating power of the heating system that is linked via a Homematic IP thermostat to be reduced, lowering the energy consumption and the associated costs. When the window and door contact is linked to an alarm siren, opening a door or window triggers an alarm when the alarm is armed. When it is configured accordingly, a push message is also sent to your smartphone. You can use the app on your smartphone to constantly track the status of the windows and doors that are equipped with the contact. Features / compatibility - Homematic IP integrates the areas of indoor climate, security, fi