These virtually indestructible covers (solid for strobe unit) are specifically designed to prevent vandalism and accidental damage to a signal unit of a fire alarm system. The Strobe Stopper is moulded in clear, thick UV stabilised polycarbonate material, the variety of spacers available can accommodate larger sounder/strobe units and retrofits – as well as weather resistance and surface mount applications. Spacer D accommodates deeper units and applications with exposed conduit electrical connections.