FVSA Rechargeable Hand Warmer, 10000mah Graphene Electric Hand Warmers Rechargeable, (13-18 Hours) Portable USB Hand Warmer. All Side Hot Hands for Winter Camping Gadgets Outdoor Sport Ski Tech Gift

Thickness description is wrong. It's .4" (3/8") at it's thinnest on the edge, but it's slightly dome shaped so it's actually .6" (5/8") thick.5.5" long 2.75" widePROS-still thinner than most hand warmers-heats up quickly-battery life (will be experimenting for specific numbers, but it was still on after 6 hours outside in the cold on medium)-sleek clean outer shell-good size to hold between hands-only 1 charger hole and 1 button with the function light built into it-usb adapter to use as a powerbankCONS-less hot than my ocoopa warmer on the same power setting-very slippery to hold without the pouch-slight rattle/loose internals-no lanyard/wrist strap ability without pouch-charging cord is uselessly short

The main reason I chose this product instead of the others because it claims "ultra thin .4 inch". This is not true. It is .6", a 50% increase over the claimed size.I also chose this one because it claims to have 13-18 hours of battery life. This is also not true. I left it turned on overnight and when I checked 11 hours later it was cold. It also takes a long time to charge, about 6.5-7 hours with a fast charger.It is also very slow to heat up. Testing it indoors, its maximum temperature was reached in 30 minutes, though it was hot in 20 minutes and warm in 10 minutes. This is so slow that you have to plan in advance when you're going to use it so you can turn it on early.It still works fine despite these issues, but don't expect it to meet the manufacturer's dishonest claims.

Don’t waste your money on this thing. It doesn’t get very hot even on the highest setting.The highest setting is how I imagine the lowest setting should be.No way are these heat ranges accurate. The highest setting is rated at 131 degrees Fahrenheit?!?! NO WAY!!! It’s far less than that.I tested it with a thermometer on the highest setting and the maximum reading I could get is 107.7 degrees Fahrenheit. The advertised heat for that setting is 131 degrees Fahrenheit. We’re 23.3 degrees Fahrenheit short!!!This thing is a waste of money.

I love these little handwarmers. I bought two. I bought the 10,000 mA hours version. These are small enough to fit in my mittens and a nice size to hold in my hand within The mitten. There are three settings and I usually have mine on medium or high. But… It’s quite cold here in Minnesota. They are plenty warm enough. The finish is smooth and soft and feels nice in my hand. The battery life is pretty great too. I use mine a couple times a day and I charge them at night while I’m sleeping. I haven’t run out of battery yet. I purchased the black color and it is a matte black finish nice and understated and doesn’t look like a toy. This hand warmer is very well-built. Feels nice and solid. It has a multifunction LED light that indicates what heat setting it is on. End it uses USB type C connector. Which is the best USB version in my opinion. Nice and secure.These handwarmers take about 3 to 4 hours to charge completely from empty. And the multifunction LED light blinks while charging and go salad when full. All cables and adapters are included within the box. These handwarmers can also be used, with the adapter, as a battery for a mobile phone or iPad or any device that runs off of USB. The handwarmers come with a soft well-built case. You can use the hand warmers within the case or just use it for storage. I have dropped my handwarmers on concrete once or twice and they sustained no to minimal damage. They seem to be sturdy well-built. I am completely happy with my handwarmers and I’m probably going to buy a couple more to keep in my coat pocket. Minnesota is Very very cold. And I don’t want incremental whether to hold me back from enjoying the outdoors. I would highly recommend this handwarmers/device battery.I attached a video. The part where I talk about the handwarmers is at about three minutes in. It was another product review initially.

Winter disc golf can be brutal when it is cold and wet with long waits between throws. We usually go through a bunch of chemical hand warmers every year. They work alright, but the sheer number of them feels wasteful. This rechargeable hand warmer is less wasteful, the heat output is better than the chemical hand warmers, and it lasts longer. The battery life is also very good. I have only killed the battery one time from a full charge, and it was after 8 hours outdoors on medium.

The hand warmer is ok, not great. The side without the charging port heats up considerably more than the side with the port, so it is not great at warming both hands at the same time. As for the size, it is a little smaller than a phone, the same thickness as a phone with a case on, and it is pretty heavy for what it is. I don't see using this often but maybe I'll change my mind when it starts to be 20 degrees outside.

I am 74 years old and my hands tend to get cold. This warmer works great, it’s easy to use and charges nicely. I usually start with it on the warmest setting and than reduce it to the middle heat setting. I have used it daily for my one hour walk since I received it (one week ago). Thinking about ordering another to have one in each mitten, but for now I just move it over to my other hand. It probably would not fit in a glove as it’s too big to fit comfortably. You could easily just put it in a pocket as well. Several friends have ordered this as well given my suggestion.

I bought this used (nothing suggesting that there was anything wrong with what I bought), hoping it would at least last the minimum time advertised. Only lasted around 5 - 6 hours on a full charged. I timed it. (Edit: that was on high, but even on the lower heat it lasts about 8 hours on a full charge on medium and a much longer time on low, which produces very little heat.) I'm gonna keep it because I'm actually quite fond of the size and flat surface area for a kind of heating stone for cramps and sore muscles, but I do suspect that this warmer is part of the trend of warmers overstating their runtime. Bummer.

Got this for the MiL, coming to EU from an exotic country no amount of first skins and clothing alone was enough! This was her favourite gift! Works as a hand wormer and a spare phone battery pack all the same!

Bei Ankunft war die Verpackung schon ein wenig ramponiert und es sah so aus, als ob sie schön öfter geöffnet wurde. Die Wärmeleistung des Geräts entspricht nicht den Angaben und ist selbst auf der roten (höchsten) Stufe lediglich lauwarm.Schicke das Gerät umgehend zurück.

Klein, handlich und praktisch.

Gutes Format für die Hosentasche.Wärmeleistung für Kalte Wintertage für mich nicht ausreichend.