So Glad I Found This! I only discovered these hand warmers existed when my friend let me borrow one of hers when we took our kids to the park. I went to buy her exact one and couldn't find it, so I ordered CozyCharge instead. I'm glad I found it because this brand actually gets a lot hotter than hers. It's small enough that I can slip it inside my glove. My hands are seriously always ice cold, painfully cold, so I use the warmer even while I'm at home watching TV. I picture this lasting a long time, but I will definitely buy another if this one ever bites the dust.