AC-MDC. The YALE Door & Window Contact is compatible with the Yale Sync & Yale Intruder alarm ranges. When set, the alarm will be activated when the door or window it is connected to is opened, and will work up to 200m away from the control panel. This is an effective option if there are larger or multiple pets in the home which would prevent the use of a motion detector. Batteries and fixings are included and it comes complete with a 2 year guarantee.. Wireless door and window contact. Triggers the alarm when the door or window that is connected is opened. Compatible with Yale Sync & Intruder alarm ranges. For use in extra rooms that need protection, such as lounge, bedroom or extension