My brother the heating guy bought me a detector for my 6x12 box trailer and as soon as I light my propane light or colman stove it goes off .It's was exspensive but worthless to me .maybe I'll put it in my house.please guys never go to sleep with a heater or stove burning ,buy a good hollyII filled bag on ebay for $30 and you will never need the heaters while sleeping.I have 3 different bags that I use and i have slept in -20 degrees confortably .If only I could spellllll .


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