STI-9841 STI Fireray Controller Damage Stopper - 11.52" H x 10" W x 3.58" D

Here is an excellent way to protect optical beam smoke detectors against both vandalism and accidental damage. Constructed of tough steel wire coated with corrosion resistant polyester, these guards can take hard knocks in stride.
As all STI protective covers, these guards are backed by a three year guarantee against breakage in normal use. Installation and servicing is easy with all screws and anchors provided. This Stopper is highly recommended for areas where abuse is severe or it is imperative optical beam smoke detectors continue to operate.