This virtually indestructible cover (slotted for sounder/strobe unit) is specifically designed to prevent vandalism and accidental damage to a signal unit of a fire alarm system. Moulded in clear, thick UV‑stabilised polycarbonate material with slots allowing the sounder or fire voice speaker to be heard. There are a variety of spacers available to accommodate larger sounder/strobe units and retrofits ‑ as well as weather resistance and surface mounted applications. Spacer B has a solid back and is moulded with an integral mounting box. For extreme conditions where dampness, water or dust are frequently present, we recommend using STI's unique, new Enviro Kit.