The Smartwares RM337 warns you for poisonous and flammable gas in your home. The 2-in-1 gas detector detects both odorless and tasteless carbon monoxide gas that's released with incomplete combustion of fuels such as car gas or natural gas that's released during a gas leak. When the sensor detects gas you home, it sounds a loud, 85-decibel alarm. The detector runs on AC power, so install it close to a power socket. The LED lights inform you about the current operation status of the detector.