Super tough protection for smoke detectors where abuse is severe. Smoke Detector Damage Stopper protects your critically important smoke detectors from accidental or intentional abuse. Easy to install in areas where physical abuse is causing false fire alarms or high maintenance costs. STI-8100 is for flush mounted smoke detectors and is constructed of clear polycarbonate. See STI-8130 for surface units. Because they're molded of polycarbonate in a highly durable design, these protective covers carry a lifetime guarantee against breakage in normal use. Easy to remove for servicing smoke detector. Tamper resistant hardware is available.