The ZT-CP3 and ZT-CP3/WP call points are unique in that they mimic the feel of breaking glass whilst offering the user the benefits and environmental advantages of a re-settable operating element. The CP3 uses a simple yet ingenious patented mechanism which consists of a rigid plastic operating element and an over centre spring mechanism. This arrangement provides real action on operation and simulates break glass activation. An activation indicator drops into view at the top of the window after the CP3 has been operated. The unit is then simply reset with a key and is ready for re-use straight away. A special Polycarbonate cover (CP3-CV) is available for extra protection against accidental activation and thus allowing the unit to operate as a double action call point. This must be ordered separately.