... visual alarm at site provided. Ventilation shut off gas supply KAB gas alarm, is designed to detect the concentration of ... visual and audible signals when the gas concentration, such as LPG, natural gas, coal gas etc., reaches the preset level. ... Working voltage: AC220V±15% 50Hz~60HzTarget gas: Combustible gas, such as LPG, natural gas, coal gas etc.Consumption: ≤3WWorking condition: Temperature: 055 ...