BUY NOW AT REI Finally, a rechargeable hand warmer small enough to fit in your gloves and designed specifically for everyday winter adventures. The Ripple is the future of on-the-go instant heat, built for those who live and play out in the cold all winter long. Crank up the heat with Turbo Mode for extra frigid days or switch to Efficiency Mode for lasting warmth on the long haul. Need heat for the whole crew? Pack extras in your pocket for backup. The Ripple's quick-charge USB-C dock lets you power up multiple warmers at once-fast, easy, and hassle-free. Plus, they come zipped up and secure in a rugged travel case. The days of cold hands and wasteful single-use hand warmers are over.FEATURES:Requires 5V --- 2A wall adapterInstant Heat! Ripple heats up in just seconds.Rechargeable hand warmers that fit in your gloves and are ready to send it. Designed specifically for skiing, snowboarding, and snowy adventures.IPX4 Water Resistant.Heat settings lasting 3 hours on High and 8-12 hours on Efficiency Mode. Charge all your warmers at once. The innovative charging station is low-profile, magnetic, easy-to-use, and uses just one cable. No more charging each hand warmer separately. Each 6-pack replaces 3600 single-use hand warmers, enough to fill a 52-gallon trash can.Each 4-pack replaces 2400 single-use hand warmers, enough to fill a 35-gallon trash can.Each set saves around $3000 worth of single-use Hand Warmers