We installed this in our trailer as we have several items that run on propane. The kids were climbing up to get an item out of a cupboard and accidently turned one of the stove knobs on they immediatly left the trailer and went outside. Nobody was in the trailer and this thing started screaming away WOW!! went into the trailer and dang near upchucked. Quickly found the knob on and turned it off and opened the windows. Not sure what would have happened had we not had this device!! Recommended if you have a trailer!!