The Safe-T-Alert 35 Series Dual Propane/Carbon Monoxide Alarm with Flush Mounting detects both gas leaks and carbon monoxide gas simultaneously; Twelve volts power means no missing or dead batteries to replace and this alarm is built for extreme RV environments; This product meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV; Available in white, brown, or black