The HOYLES 100 Series Exitguard Keyswitch Door Alarm is designed to help deter the misuse of emergency exit doors and fire exit doors. When the protected door is opened, the integral high power 105dB sounder activates, providing a clear audible warning that the door has been used.It features keyswitch control, visual alarm indication, tamper protection and auto re-arm functionality, making it a practical solution for improving exit door security in commercial, public and shared-use buildings. It is suitable for use in retail stores, public buildings, schools, hospitals, offices, warehouses and other sites where emergency exit doors need to remain secure but accessible.The battery powered model is ideal for locations where a separate power supply is not available and the protected door is opened infrequently and is supplied with 6 x AA alkaline batteries, which can last up to 3 years depending on usage. It will also continue to operate for at least two weeks after a battery fault indication has been shown, helping to support ongoing door protection until batteries are replaced.