Please refer to the RS website for FIA Guidance on Visual Alarm Devices （VAD） regarding the conflict between BS 5839 and EN 54-23
Sounder / Beacon - VSO-LED Series
Suitable for use in factories, machine rooms, workshops and areas where sounders alone may not be sufficient to raise an alarm 1 flash per second Can be used with or without a detector Locking cover plate is available if a detector is not being used （see stock number ; 669-5382 669-5382 ）
