1. design of alarm sensor body, high reliability sensor. Easy to install and operate. 2. Made of materials, safe and stable. 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 vehicles,marine, such as motor home,boat,yacht and so on. Operating Voltage: 12V DC Standby Current: 90mA Alarm Current: 100mA 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: -10 +50 Environment Humidity: 95 % RH Installation: wall-mounted Color: White Material: ABS Package Contents: 1 x Alarm Sensor Only 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.