Apollo XP95 Sounder VAD Base is a loop-powered sounder and EN 54-23 approved VAD combined with a standard intelligent mounting base. It is used to signal a fire alarm in enclosed areas. The Sounder VAD Base is loop-powered powered so needs no external power supply. It operates at 17 to 28VDC and is polarity-sensitive. The sounder VAD base is moulded in polycarbonate and has stainless steel contacts that accept solid or stranded cables of up to 2.5mm². The XP95 sounder VAD base responds to its own individual address set with a DIL switch. It also responds both to a group address, set by means of a 4-segment DIL switch and to a synchronisation address which is embedded in the unit. This Bases will operate only with compatible control equipment using the Apollo XP95 or Discovery protocol. The features of the Sounder VAD Base are available only when it is connected to a control panel with the appropriate software.