Guard protects horns, strobes and speakers against vandalism and accidental damage. Designed to protect System Sensor SpectrAlert Advanced series of notification appliances. Constructed with 9-gauge steel wire, coated with white corrosion resistant polyester, they are tough against accidental or intentional damage. Guard is recommended for areas where abuse is severe or it is imperative horn/strobe/speakers continue to operate. For surface mount. Installation is fast and simple with the screws and anchors provided. UL/cUL Listed.