Homematic IP window and door contact optical, pack of 3 The intelligent and smart sensor for the Homematic IP system offers an improvement in energy efficiency when heating, as well as secure access control of windows and doors. Thanks to an infrared photoelectric sensor, no counter contact is needed on the door or window frame. Functions/compatibility - Homematic IP offers integration of indoor climate, security, fire and water protection, weather, lighting and shading - easy to install, easy to expand and easy to secure - detection and transmission of the opening state of windows and doors - Options for operation: a) Integration via Homematic IP Access Point with configuration and operation via free Homematic IP App for iOS and Android and free cloud service (enables voice control via Amazon Alexa or Google Assistant) b) Integration via CCU3 control panel with local operation via WebUI Browser-based for Mozilla Firefox®, Microsoft® Internet Explorer, Google Chrome, Safari - Security