These virtually indestructible polycarbonate covers (slotted for horn or speaker units) are designed to stop vandalism as well as accidental damage. Molded of clear, thick, UV-stabilized polycarbonate material. Many tough, clear spacers are available for larger strobe/horn units, retrofits, surface-mount and weather resistant applications. Enviro kits are also available for harsh conditions. These polycarbonate covers have a fast and easy installation process for any user. There is a three-year guarantee against breakage of polycarbonate in normal use. Please see chart for light and sound loss information.