Homematic IP Wireless window contact

(This text is machine translated) The Homematic IP window and door contact is part of the Homematic IP smart home system and reliably monitors a door or window. To do this, the window contact relies on an innovative optical sensor. This makes an additional magnetic contact superfluous and thus reduces the installation effort. The built-in infrared light barrier immediately recognizes whether the window is open or closed and passes this information on to the system. The "plus" design enables low-maintenance operation by accommodating two AAA batteries, which ensure a particularly long battery life of typically four years. The sensor takes on several tasks in combination with other Homematic IP devices. On the one hand, it ensures that the heat supply is automatically reduced during ventilation via a Homematic IP radiator thermostat. On the other hand, it reliably monitors access to your own four walls. So if a window or door is opened when protection mode is activated, the window contact triggers an alarm v...