4-in-1 Upgraded Combination Natural Gas Leak Detector and Carbon Monoxide Detectors, Dual Sensor Gas Leak Detector & Carbon Monoxide Detectors Plug in (Temperature & Humidity Sensor) for Home, RVBrand: NORJAN Color: Black Features: 4 in 1 Upgraded Detector: The upgraded 4 in 1 Natural Gas Leak Detector & Carbon Monoxide Detector is equipped with natural gas, carbon monoxide, temperature, and humidity detectors, powerful functionality, dual sensors, a dual alarm system, and quick response to protect your family and personal safety in all directions. It supports carbon monoxide, methane, LPG, LNG, Fuel, natural gas, propane, fuel, ethane,