The Sounder Visual Alarm Devices provide both audible and visual alarm in situations where one alarm type would not suffice, i.e. in a noisy workshop or machine room; or in areas where deaf or hearing-impaired persons may be present. EN54-3 & EN54-23 Compliant 7 Adjustable volume levels, 15 Tone Pairs, Red or White Flash Built-in controllable Isolator (when used with XPERT 8 Base) Easy installation on Apollo XPERT 7 or 8 Base
