AC-KF. The YALE Key Fob is compatible with the Yale Sync & Yale Intruder alarm ranges. It allows for remote arming and disarming of your alarm, plus an emergency alarm trigger option, within a range of up to 200m. Batteries are included and it comes complete with a 2 year guarantee.. Allows for wireless arming/disarming of your alarm. Emergency alarm trigger feature. Compatible with Yale Sync & Intruder alarm ranges. 200m range