The GfS DEXCON with espagnolette closures is a user-friendly, easy-to-install complete battery-powered security system. The system is mounted over the espagnolette closure. As soon as it is opened, an acoustic alarm sounds, which can only be reset by authorized persons with the system key. Automatic reset can be pre-set after expiry (opening time 30sec or 3 min) the system will reactivate.