The Ocoopa black UT4 electric hand warmer is a practical and efficient device that provides pleasant warmth. With an elegant black design and a sturdy aluminum construction, this hand warmer offers not only functionality but also durability. It is powered by a high-capacity battery that allows for up to 8 hours of heating, ensuring you don't have to compromise on comfort even on cold days. The hand warmer features three different heat settings, allowing for personalized adjustment of warmth intensity. Safety features include an overheating protection system for added security. The UT4 is reusable, making it an eco-friendly choice for those who value sustainability. Whether for outdoor activities, at the office, or at home, this hand warmer is an essential companion for keeping your hands warm and enhancing your well-being.