The OLV Magnetic Rechargeable 2 Pack Electric Portable USB Hand Warmer offers 18 hours of heat with its rechargeable battery. This hand warmer is perfect for winter sports activities and its portable design makes it convenient to use on the go. The sleek black color and magnetic feature add to its functionality and ease of use. Backed by a 1-year manufacturer warranty, the OLV hand warmer is a reliable and durable option for staying warm in cold weather conditions.