Features: 1. Unique design of alarm sensor body, high reliability sensor.Easy to install and operate.2. Made of premium materials, safe and stable.Durable for long time use.3. Two state of indicator light, red light indicates alarm, yellow light indicates failure.4. in and output switch terminal pair for integration into external alarm system. 5.It is applicable to vehicles,marine, such as motor home,boat,yacht and so on. This is a gas alarm sensor, remind you to monitor natural gas safety.A perfect safety tool used in motor home, marine, vehicles.It can detect the leakage of propane, butane, LPG, natural, town, coal, common gasses.It is very simple to use and convenient to install.Specifications: Condition: Color:White Material:ABS Operating Voltage : 12V DC Standby Current : 90mA Alarm Current : 100mA Warm-up (stabilisation) Time: Indicator : Green LED Alarm Gas Level : 10 5 (% ), 0.5 0.25 (VOL %) Alarm Indicator: red LED, flashing Alarm Sound Level : 85dB/m Failure Indicator: yellow LED on, continuous tone Operating Temperature: -10C ~ +50C Environment Humidity : 95 % RH Installation : wall-mounted Size: 11.5 x 7 x 5cm/4.53x 2.76 x 1.97in Weight: 151g Package Contents: 2 x Alarm Sensor 2 x Screw Caps 2 x Screw Only the above package content, other products are not included.Note: Light 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.