Review on Propane/Natural Gas Detector: Home Gas Leak Alarm, Tester & Sensor with Sniffer; Monitor Combustible Explosive Gas Level: Methane, Butane, LPG, LNG; Voice/Light Warning, LED Display & eBook by Troy Hamilton

We accidentally left the gas stove on several times (press the button when cleaning) and came home with a strong smell of gas in the house. The alarm clock rang last time. Experimenting with "accidentally left on" gas, we found a spot above the stove where the alarm went off after about a minute. This alarm won't help us much if we screw up when we leave the house, but it should at least help us if the handle is bumped while someone is in the house.