BrematicPRO wireless door/window contact TFK868 01 Doors and windows perfectly secured: As soon as the magnetic part moves away from the sensor or someone tries to dismantle the door and window contact, an alarm is triggered. This means that no open window or open door goes undetected. When connected to the gateway and app, you can also be notified directly. Detects whether doors/windows are open or closed. Easy, flexible installation on windows or doors including mounting plate. Installation by screwing or gluing.