I like this hand warmer design. You can use it as a single large warmer or separate it to use for both hands. It heats up pretty fast and there's 3 different levels of temperature. I use mine for when I go fishing. It's so nice to be able to keep my hands warm. It's usually 55F on the piers so having stiff hands makes it hard to rig up the fishing hooks and lines. 

These amazing little wands of fire do exactly what they claim. They get really hot, fast. They'll definitely warm your hands and anything else that touches them. I was surprised by how hot they get.

The hand warmers design fit hands well. There are two units, that magnetically connect, but separate so that one can be held in each hand. a full charge, I put the unit on the lowest heating level. The heat was adequate to warm one.

My wife seems to like these better than any in the past. Really likes how they magnetically pair together and the smaller size when separated that fit nicely into her gloves. Bettery life, so far, is very good.

I hunt a lot during cold weather so this little warmer came in very handy. I put them in my hands and place my hands in my coat pocket and they heated up my hands in no time. No more freezing hands for me during hunting season.

These hand warmers work really well and dont have hot spots. On the lowest setting its a nice warmth without my kid saying its too hot for him. The size is perfect for adult and little hands alike. I love that they magnetize together for storage and can double as a power bank.