Morley-IAS Body Colour - White Flash - Red Lens - Clear Isolator - Yes Wall Sounder VAD - Wall-mounted, addressable, loop-powered sounder, EN54-3 approved, with Visual Alarm Device (VAD), EN54-23 W & O class compliant. EN 54-23 COVERAGE STANDARD OUTPUT MODE: W-3.6-10.5, W-2.4-10.5 EN 54-23 COVERAGE HIGH OUTPUT MODE: W-4.2-11.5, W-2.4-11.5 EN 54-23 COVERAGE LEGACY MODE: O-2.4-3