FALSE ALARM RESISTANT - Our Intel Check circuit eliminates false alarms caused from momentary exposure to LP Gas aerosols or to out gases. This allows for complete installation and testing during production. FULLY OPERATIONAL DURING MUTE CYCLE - Life safety is our first priority complete protection. If a leak is detected and the alarm is muted by the RVer, the Safe T Alert detector continues to provide complete protection. Every 30-seconds the LED will flash red and the unit will chirp to let you know that a dangerous condition still exists. Once the gas is cleared the unit resets, it will immediately alarm if high levels of gas reoccur - even during the mute cycle. RAPID DIAGNOSTIC TEST - No Hazardous Gas Required. With a touch of the Test Switch the microprocessor performs a full diagnostic analysis, including sensor circuit operator, verifying the alarm is working within specifications. Other manufacturers require the use of hazardous gas test, which can cause permanent sensor damage. WIDEST OPERATIONAL VOLTAGE RANGE, 7-Volt to 16-Volt DC - The 40 series alarm will operate until the battery is down to 7-Volt, without an annoying low battery warning alarm. Other detectors alarm at 10-Volt causing irate RVers and dealers to disconnect the unit.