Zippo 12-Hour Reusable Hand Warmer - High Polish Chrome Finish - Perfect for Outdoor Activities, Camping, Hunting & Winter Sports

I have been using the Zippo Hand Warmer about a dozen times and have found that it provides ~20 hours of warmth with one filling -- significantly longer than the advertised 12 hours! Trust me, I have no complaints there! I would have been quite happy with 12 hours, but the longer-than-expected operating times are a very, very pleasant surprise.- FunctionI use the Ronsonol brand of lighter fluid and it works just fine. I have not encountered any problems with lighting the catalytic burner. Important note: the catalytic burner doesn't actually burn; it merely smolders with BARELY a glow. So you can't really tell when it's lit. The only way you can tell it's lit is by the warmth it radiates. I always place it in the flame for 5-6 seconds while I moving it around to avoid hot spots -- and it's never failed to light.I can't help but wonder if the complaints about the hand warmer "not lighting" are due to users expecting to actually *see* it burning. Like I said earler, you won't see it burning, but all the same it IS lit. The way you tell is by the warmth it emits. It starts off emitting a very faint amount of heat and gradually heats up.The catalytic burner will last about 70 uses, after which it has to be replaced with a