MTI INDUSTRIES 20-441-P-BL Detector Propane 12V Black UL Listing for Recreational Vehicle Use - Meeting RVIA Requirements. Test/Reset Button - Mutes Alarm during Ventilation. Tests All Detector Functions with One Touch. No Dangerous Gas Required to Test Alarm. Wide Operational Range, 8-16 Volts. Avoids most Low Battery Voltage Alarms. Full Operation During Mute Cycle and at Extreme Temperatures -31F to +150F. Includes End Life Feature.