【5in1 CO & Smoke &Natural gas detectors】Our Gedsffati newest combination 5in1 detectors Integrated carbon monoxide, smoke, Combustible gas( like natural gas, propane, methane, natural gas, coal gas, gasoline, Hexane, butane, benzene, ethyene oxide, acetylene, LPG, LNG, etc),temperature and humidity sensors, real time to detector the environment gas safety for us. 【Plug in & Play design】US standard plug is compatible with 110V to 220V AC outlet. Fits all US standard AC outlet in bedroom, kitchen, living-room, basement, hotel room, etc. Just Plug in and the detector will real-time work all day. 【Built-in 2000 mAh emergency Blackup battery】Provides 18-20h working time, helps to cope with sudden power outages. Rechargable lithium battery design, Compared to other disposable batteries, we can help you save a lot of battery replacement 50$+ costs. 【2.1’’ HD Screen】 All the datas real times and dynamically show on the HD screen, we can read the data faster from the big icons like: CO ppm, Smoke indicating bar, Combustible gas warning icon, humidity, temperature, CO indicator icon, plug and alarm status. 【All gas environment safety we care for you】 Built-in independent Smoke / CO / Combustible gas sensor, HD screen visible and 85 dB audible design is real time detect the gas environment, bring you extra safety for you and family. HAKINAKU 5IN1 Plug in Smoke & Carbon Monoxide Detector & Combustible Natural Gas Combination Builti-in Backup Battery HD Screen [Smoke CO Gas Temp Humidity Sensor] for Home Hotel RV ( 1-Pcs, Black)