H series gas leak alarm is a kind of wall-hung household gas alarm designed to detect the concentration of combustible and toxic gases or vapors Provides visual and audible signals when the gas concentration reaches presetting level, remind you take prompt favorable action, you may start up other link equipment, ventilate gas or shut off gas supply to avoid fire, explosion, suffocation, and other evil accident Alarms are available for liquefied petroleum gas (LPG), natural gas (methane), propane, hydrogen, town gas, smoke Can be installed at home and any other similar place Working voltage: AC2 20V +/- 15%, 50Hz or DC 12V Target gas: combustible gas Power consumption: 3W Temperature: 0-55 deg. C Humidity: < 95% Response time: 30s automatic resume Gas sampling: natural diffusion Preset alarm point: Combustible gas: 10%LEL CO 150ppm H2 1,000ppm Alarm method: visual and audible Alarm sound: 70dB Weight: 270g Dimensions (L x W x H): 137 x 75 x 49mm Optional functions: relay output and gas shut off valve output