Securing your home, apartment or small business has never been easier or more affordable. Simply install the Mace Brand Door & Window Guard on any door or window and when pressure is applied, the alarm is triggered and will sound at any attempt of forced entry. Installation is quick and easy. The Mace Brand Door & Window Guards is always active so there is no forgetting to turn it on. Any forced entry to a protected door or window will activate the ear-piercing 115 dB siren for five seconds. The alarm will sound continuously for up to one hour if the pressure is not released. The Mace Brand Door & Window Guard has been designed as a secondary security device for use in conjunction with an existing door lock, deadbolt, window sash lock or other locking system. The Mace Brand Door & Window Guard is not intended as a primary locking device. The device is suitable for indoor use only. Requires one CN23A battery, included.