Venswell Rechargeable Hand Warmers, 5200mAh Electric Portable Hand Warmer/Power Bank, Reusable Hand Warmer, Single/Double-Side Quick Heating, Best Winter Gifts

These are great hand warmers! They take a bit to warm up, but once they do they radiate heat! I was surprised by how much heat these put out. I keep them in the inside pockets of my motorcycle jacket and they keep my core warm on those 32 degree winter commutes. I haven't tried the power bank aspect yet, because I have dedicated PBs for that purpose. Even if these were JUST warmers, they're worth the buy!!!

Haven't tried to use product yet, but there are no written directions in the box explaining how to use it.

Product does what I expected.

My band marched in Macy's Thanksgiving Day parade 2019 and had to spend about 3 hours outdoors waiting for the parade to start. I knew our hands were gong to be cold and needed a warmer. Most members of the band bought temporary warmers that didn't' last too long. This warmer lasted long enough prior tour marching to keep my fingers from getting numb. It is very light weight and its size fits easily in a front pants pocket. Now that I am back home in Florida, I don't need it anymore as a warmer, but it has a connection that lets you use its charge as a spare battery to charge your cell phone. Amazing multipurpose.