gas alarm, is designed to detect the concentration of combustible, explosive and toxic gases, adopts high-quality gas sensor with advanced technology and superior craft. It provides visual and audible signals when the gas concentration reaches the presetting level. It reminds you to take prompt action. You may start up other link equipment, open windows or shut off gas supply to avoid fire, explosion, suffocation, and other malignant accidents Specifications: Working voltage: 220V AC ±15%/110V AC ±15% 50Hz or 12/24V DC Consumption: ≤3W Working condition: Temperature: 0 to 55 degrees Humidity: <95% RH Response time: ≤30s automatic resume Sampling method: natural diffusion Alarming method: visual and audible Alarm sound: ≥70dB Weight: 300g Dimensions (L x W x H): 135 x 82 x 41mm Optional function: relay output and gas shut off valve output