Description:   This is a gas alarm sensor, remind you to monitor natural gas safety. A perfect safety tool used  in motor, marine and home.  It can detect the leakage of propane, butane, LPG, natural,  town, coal, common flammable gasses. It is very simple to use and convenient to install.  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. Built in and output switch terminal pair for integration into external alarm system. 5. It is applicable to Leisure craft, vehicles and 12V Scenarios, such as motor home,boat,yacht,, general marine and so on. Specifications: Condition:100% Brand New Color:White Material:Metal+Plastic Operating Voltage : 12V DC Standby Current : ≤90mA Alarm Current : ≤100mA Warm-up (stabilisation) Time: 180s Power Indicator : Green LED Alarm Gas Level : 10 ± 5 (% LEL), 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*7*5cm/4.53*2.76*1.97in Weight: 153g Package Included:  1 * Alarm Sensor       1 * Screw       1 * Screw Cap   Note: Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.                  .wang-edit-text{                     font-family:'Arial' !important;                 }                 .wang-edit-text table {                     border-top: 1px solid #000;                     border-left: 1px solid #000;                 }                 .wang-edit-text table td,                 .wang-edit-text table th {                     border-bottom: 1px solid #000;                     border-right: 1px solid #000;                     padding: 3px 5px;                 }                 .wang-edit-text table th {                     text-align: center;             }