The Homematic IP contact interface ensures reliable monitoring of windows or doors in conjunction with connected contacts via the Homematic IP smartphone app – even while on the go. The long battery life of up to 4 years and the autonomous operation without connection to a power supply provide for extremely easy handling. A simple connection can be established with a glass break sensor or magnetic contact using a two-wire cable. The screwless terminals make the connection extremely convenient. The wireless communication and battery operation also allow for flexible and easy installation with the included mounting materials, for example, on a wall or on a window or door frame.