NUVO Lighting 62-1746-EM BLINK Pro, Emergency Battery Backup, 7in, Round Shape, White FinishPiece of mind and safety are at the forefront of the Blink Pro Emergency Battery Backup. It features quick-snap installation, and mounts to 3 and 4 inch junction boxes, making it a breeze to install.Emergency Battery Backup for Blink Pro 62-1746 and 62-1748 surface mounted lightFeaturing alert function, test indicator combo button, 90 minute battery runtimeMounts to 3 and 4 inch junction boxes and compatible with 120/277V Blink Pro fixtures onlyMeasures 1.24-in H x 7.09 diameterFinished in whiteDie-cast aluminum constructionIdeal for corridors, closets, kitchens, bathrooms, and bedrooms5 year warrantyQuick Snap Installation