System Sensor SBBCWL Universal Ceiling Surface Mount Back Box,

System Sensor L-Series offers a wide range of Audible Visible (AV) accessories to enable you to meet a variety of application requirements. White, ceiling-mount, compatible with horns, strobe, horn strobes, chimes, chime strobes, speakers and speaker strobes. Main Features L-Series Surface Mount Back Boxes are the best solution in locations where you have a hard surface to mount to. Show More Show Less