1. 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 helpful in solving this problem. The detector signal will activate when dangerous levels of propane gas are detected. 2. LOUD, AUDIBLE ALARM SYSTEM - Along with a test/reset button that lets you test and silence unwanted triggering, the gas detector propane system produces an easy-to-hear alarm, so you can respond quickly even in the middle of the night. 3. A reset/mute circuit can be activated to temporarily mute the detector while you are venting. 4. Color: White 5. Material: ABS 6. 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 the propane detector is 5 years 7. 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 8. Package Contents: 1 x Propane Detector 1 x English manual Only the above package content, other are not included. 9. Note: Light reflection and different displays may cause the color of the item to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.