The Smartwares Gas Detector RM400 warns you of flammable methane, natural gas or propane and butane gas in the home. When the sensor detects gas in your (holiday) home, the detector alerts you with a loud signal of 85 decibels. Determine in advance which type of gas you want to detect and hang up the detector in the vicinity of the boiler, geyser, boiler, gas heater or gas stove. This Smartwares detector works on mains power and, in the event of a power failure, switches to a 9V backup battery. The LED lights inform you about the operation of the detector. You simply test the detector with the test button.