S4-711-V-VAD-LPW - Dual Optical Heat Detector Voice SounderWhat type of detector is the 's4 711 v vad lpw gent s quad dual optical heat detector voice sounder'? The 's4 711 v vad lpw gent s quad dual optical heat detector voice sounder' is a multi sensor detector that uses dual optical and heat sensors to provide early detection of smoke and fire. It is equipped with an integral voice sounder and meets the safety standards set by the Vigilon fire detection and alarm system. Its white color and advanced