These magnetic alarm can be mounted to any door or window for preventing unauthorized exits. • Prevents resident elopements • Installs in seconds with adhesive backing • Model number 909223 has a three-position switch: off, chime, buzzer • Perfect for supply closets, medicine cabinets, windows, and doors • Model number 909223 resets itself when door or window • Model number 909222 has a three-position switch: off, high, low |