We bought 2 of these sixteen months ago and the one installed by my gas stove died completely. I was smelling gas, and called the gas company who fixed the leak, discovered this faulty device and told me I was blessed not to have killed myself as well as my neighborhood. Please beware, don't buy this Safety
Siren HS80504)

we had the same problem as the review above . gas stoves with spark igniation are prone to this. i could not smell the gas because i was downstairs and the gas was filling up the upstairs. when my wife came home and opened the front door it pulled the gas out, it was scary how much gas had built up and how fatal the situation could have been.

we bought this unit and we are glad we did.

I have a friend who recently started her 80th year. Unfortunately, her sense of smell is so bad, that she can not smell the "rotten egg odor" if the gas is left on. She had finished cooking something and somehow hit a burner valve without hitting the igniter. I happened by and the smell was terrible...a close call. So we bought one of these alarms. Plugged it in and forgot about it. A couple of weeks ago, the same thing happened; however, the detector went off as it should. If you have even the slightest doubt, buy one and never, ever say I wish I had.