propane detectors are used in recreational vehicles. Propane has a certain percentage in the air and will explode. It's your RV, 's biggest safety hazard, so propane alarms are your best help in solving this problem. The detector signal will activate when dangerous levels of propane are detected.LOUD, AUDIBLE ALARM SYSTEM - Along with a test/reset button that lets you test and silence unwanted triggering detector propane system produces an easy-to-hear alarm, so you can respond quickly even in the middle of night.A reset/mute circuit can be activated to temporarily mute the detector while you are venting.color:WhiteMaterial: ABSBuzzer alarm situation:1. The voltage is less than 8V2. Sensor failure3. The propane concentration is too high4. The use time of propane detector is 5 yearsparameterPower supply: 12 Working voltage: 8-16 Operating temperature: -31F to 150F (-35C to 66C)Relative Humidity: 15% to 93%Housing Dimensions: 4 inch W x 2.5 inch H x 0.75 inch DProduct 10.2 x 6.5 x 2.0cmProduct weight 73.1gAccessories weight 8.6gWiring length 14cmPackage Contents:1 x Propane Detector1 x English manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.