Meets requirements set by RVIA for CO alarms and propane detectors. Test/reset button - tests both alarm functions with one touch. Both alarms are fully operational during mute cycle and will re-alarm if hazardous conditions recur. 12 Volt - hard wired model prevents accidental disconnection. UL listed for recreational vehicles and unconditioned areas for both carbon monoxide and propane/natural gas. One year limited warranty. Case size - 6.375"W x 2.875"H x 1.25"D. Black.