MJ Gear 10400mAH USB Rechargeable Hand Warmer Multi-Function with Built in Ultra-bright LED Flashlight, High Capacity Power Bank for Smart Phones and Other Digital Devices FREE POUCH (Green)

Stays really hot but only for 5 hours. Specifications say 8-10 hours.

These are wonderful. I bought one for myself and liked it so much, I got one for my son. It's always handy nowadays to have a battery charger since we have so many gadgets. The flashlight is useful. The warming feature is great, particularly for when I work in the cold. It lasts a long time. I will be grateful when technology gets better and I can get the same power and longevity in something smaller than this package size because it is often in my purse.

I had my iphone 5 plugged into it, and didn't notice that the battery had lost all juice. When I went to retrieve the iphone, both were dead - PERMANENTLY. But the few times I was able to use it, the hand warmer functioned well, the light seemed a bit useless, and it kept plenty of battery power.

I own several usb hand warmers to help get through cold soccer practices and games. This one works well and certainly gets warm enough to cover our 3+ hours on the field, but the shape isn't my favorite. I prefer the smaller models that fit better in my hand and don't feel as heavy in my pocket.

I highly recommend this product as a best HAND WARMER for a 10400mAH. Battery last long. It charges quickly as expected. This rechargeable Hand Warmer provides you warmth and comfort wherever, whenever you need it. The pouch captures the heat and stays warm inside. NOt only it gives warmth. It has a USB plug where you can charge your phone, The brightness of flashlight is an added help when needed in dark places,it also has a blinking functionality and can be use as a warning light. I have compared this product side by side. I bench-mark tested them to ensure the described features of the product are accurate. 100% the product passed with an excellent performance. I highly recommend this product to you all when you are looking for a Hand Warmer with added features. The seller of this product hit it right. Grab one as a gift to your friends or have it as your personal everyday use :)