The MTI Industry Safe-T-Alert Photoelectric RV Smoke Detector alerts you of smoke and fire inside your RV and features a sealed-in, long-lasting Lithium battery that you won't need to replace and always remains on for your ultimate safety. Built in Test/Hush functions. Lithium battery life is approximately ten years.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov