This wireless indoor sensor will protect any door or window opening. DIY installation is easy and instant with included damage free 3M dual lock adhesive. You can easily add Door/Window Sensors to your tattletale security system at any time. With optional Chime Mode you be notified of door/windows opening and closing while the system is disarmed by a pleasant chime sound. The High Performance Door/Window Sensor can protect any door or window up to 1000’ from the base tattletale unit! When used with our High Performance Wireless Signal Booster to add an additional up to 1000′ per booster.