The speaker units of the WSP range, featuring a refined and modern design and ideal for both background music and speech, have been designed specifically for schools, hospitals, waiting rooms, hotels, shops, offices and restaurants. They can be either wall-mounted or ceiling-mounted. The housing is made of white selfextinguishing ABS (UL94-V0) with a metal front grille. Each unit has a ceramic terminal block and a thermal fuse. The bi-directional WSP 406 TWB/EN speaker units is suitable in particular for installing in transit areas and corridors. The models with the suffix -EN were designed specifically for use in emergency and evacuation systems (VES). They are certified for compliance with EN 54-24:2008.