propane gas 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 gas are detected. LOUD, AUDIBLE ALARM SYSTEM - Along with a test/reset button lets you test and silence unwanted triggering gas 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:Black Material: ABS Buzzer alarm situation: 1. The voltage is less than 8V 2. Sensor failure 3. The propane concentration is too high 4. The use time of propane detector is 5 years parameter Power 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 D Product 10.2 x 6.5 x 2.0cm Product weight 73.1g Accessories weight 8.6g Wiring length 14cm Package Contents: 1 x Propane Detector 1 x English manual Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.