SOUNDS AN ALARM The unauthorized opening of this window handle sets off a loud alarm. Double security: If you equip your windows with this window handle, you can breathe easy. It is not only secured with a key, but also has an alarm function. The window handle is universally applicable and can be attached to windows made of aluminum, plastic or wood. The alarm function sounds at 110 decibels. Thanks to 3D magnetic field sensors, false alarms can be ruled out. The window handle serves both as a child safety lock and as protection against burglars.