Direct drop in replacement for Safe-T-Alert Mini LP Gas detectors model 20-441. Upgrades old LP gas detectors to Dual LP gas and carbon monoxide alarm. Meets requirements set by RVIA for CO alarms and propane detectors. Test/reset button tests both alarm functions with one touch. 12 Volt; hard-wired. UL listed for recreational vehicles and unconditioned areas for both carbon monoxide and propane/natural gas. One year limited warranty. 3.5"W x 2.5"H x 1.25"D.