OCOOPA Rechargeable Hand Warmers 2 Pack - 10000mAh USB-C Portable Heater with 4 Heat Levels up to 136°F - Magnetic Electric Hand Warmer for Raynaud's, Golf, Hiking, Skiing & Winter Outdoor Activities - Perfect Tech Gift for Men & Women (UT2s MagTwins)

This product is really good. They charge fast, keep in mind you need to make sure the charger you use is a good one, to verify, one of the blue lights will turn green to indicate fast charging as label in the instructions (look at last picture for reference). I feel like most of the other reviews used a slower charging setup. I use my Google pixel 7 charger which is USB-C to USB-C. You can also use the cables provided but you need a good power box. The heat it provides is excellent, I live in Chicago so the weather is cold and these work great. I really like the fact that it can be on the highest heat setting and once I turn them off it takes seconds to cool down, pretty neat feature so I can store them away without risking heat damage to anything. I also like the ability to use these as a power bank, Great feature. I like that it also comes with 2 charging cables and a carry bag. Overall really solid product, great heat output with multiple heat setting and great additional features and it's not heavy. I would buy again. I recommend this product.Now on the downside....First in foremost the instructions are terrible and can be updated. This version of handwarmers which are the gamer edition don't come with the dual USB-C, meaning I have to use 2 different chargers or charge one at a time which is just inconvenient.