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About the detectorThe independent gas detector BH-KB1902, measuring 0~100%LEL, is an intelligent monitoring device for natural gas . The and red signals will be triggered once the concentration of the monitored gas reaches , so as to remind you in time and protect your family. Widely used for gas detection for home, restaurant, hotel, recreational vehicle, etc.Please note: 1. It is not suitable to be installed too close to the stove. 2. It is not suitable to be installed in the place where the smoke is too large. 3. It is not suitable to be installed near the exhaust fan, doors and windows, bathroom and other water vapor, gas. Where the flow is larger.4.Without battery, you need USB power to auto detectTechnology Specification 1. Please start a self-check button every 6 months to ensure the normal working condition. 2. Please use soft brush and dry flannel to clean the surface and clear away dust to ensure good air permeability and good indication. 3. This detector is designed for indoor use only. Please keep it away from rain . Model: BH-KB1902 Detecting Gas: Natural gas(CH4, Methane) Working Environment: Temperature: 0 ~ 40°, Celsius Humidity: