4-in-1 Gas & Carbon Monoxide Detectors: Plug-in natural gas detector & carbon monoxide alarm can detect levels of carbon monoxide and natural gas, as well as the temperature and humidity of the surrounding environment. High Sensitivity Sensor: This co detector is equipped with high sensitivity catalytic combustion sensors and high-precision electrochemical sensors, ensuring excellent detection accuracy and sensitivity, and providing users with more reliable safety. Plug and Play & Compact Design: The carbon monoxide detector adopts an AC plug and play design, which can be inserted into any standard socket with a voltage of 110-220V, saving installation time. 24H real-time monitoring of gas concentration, constantly safeguarding respiratory health. Wide Detection Range: Combination gas & carbon monoxide detector suitable for detecting methane, natural gas, propane, butane, ethane, coal gas, toluene, and other combustible gases. Used in homes, kitchens, garages, campers, restaurants, hotels, etc. Gas detectors can reduce the risk of injury caused by gas leaks and protect you and your family. Worry-Free After Service: We are willing to provide you with unconditional returns and exchanges within 90 days. If you have any questions, please contact us by email, we will try our best to help you solve the problem.