Pre-owned pair of small heated glove liners. I wear a size 6-7 glove normally. These fit a small woman’s hand, or a comparably sized hand for any other person. I live in a very cold climate and these weren’t lasting as long as I wanted for my purpose (long, cold bike rides). If you are in a milder climate or don’t need the heat for as long, or want to find a spare set of batteries, these might work for you. I was getting 30-60 minutes, again, in a cold climate (northern Illinois). See the website below for the full manufacturer description. https://firedupx.com/products/far-infrared-heated-compression-glove-liners - retail $199