Safe-T-Alert Combo Carbon Monoxide Propane Alarm Surface Mount - White. 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 or black. Features/Specifications: Double-duty alarm detects both gas leaks and CO gas simultaneously Reliable 12V power means no missing or dead batteries to replace Durable and built for the extreme RV environment Meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV Dimensions: 6-3/8" W x 3-1/2" H x 1-77/200" D. Features of Safe-T-Alert Combo Carbon Monoxide Propane Alarm Surface Mount Double-duty alarm detects both gas leaks and CO gas simultaneously Reliable 12V power means no missing or dead batteries to replace Durable and built for the extreme RV environment Meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV Dimensions: 6-3/8" W x 3-1/2" H x 1-77/200" D. Package Contents: Safe-T-Alert Combo Carbon Monoxide Propane Alarm Surface Mount Safe-T-Alert 35-741-WHT: Combo Carbon Monoxide Propane Alarm Surface Mount - White