Accepted by many fire marshals, this cover is designed for areas where a u201cbreak glassu201d cover is specified, such as unsupervised areas. The Break Glass Stopper® consists of a red polycarbonate cover, mounting frame, a pane of single-strength clear glass (which is easily replaced when broken), a glass-breaking bar, screws and anchors for installation. The protective cover is fast and easy to install and allows the fire alarm to remain clearly visible and accessible.