Large Capacity: This Hand Warmers is equipped with a 4000mAh large capacity battery, and the heating time in the greenhouse environment can reach 3 hours (the working time depends on the external temperature and heat setting). You can use Hand Warmer when you feel cold at home, office, camping, hiking, fishing, skiing, traveling or outdoor sports.$ Fast Double-Sided Heating: Double-sided rapid heating, constant temperature heating, large double-sided heating area, uniform heating effect, warmth more in place. There are 113/140 (45/60) two grades of temperature can be switched. Choose the temperature you need to drive away the cold for hands, warming not hot hands, give you just the right warmth.$ Safety & Portable and Compact: Use high-quality PC material, high temperature resistant, flame retardant materials, environmentally friendly PVC, intelligent temperature control protection, giving you a full sense of security. The surface coating delicate treatment. The size of the fuselage has been finely measured and conforms to the ergonomic design. It is small and exquisite, can be carried with you, and you can enjoy the warmth of being held in your hand at all times.$ Hand Warmer & Power Bank: More than hand warmer, but also power bank. It can dissipate the cold for both hands, and can also charge the mobile phone in an emergency. This Hand Warmers Rechargeable can make you feel warm in the cold winter.$ The Most Anticipated Gift: Electric hand warmer is a gift that can bring surprises and warmth to people. In the cold winter, you can give this best choice gifts to your family, lovers, and friends on Christmas, Thanksgiving, and birthdays, so that they can enjoy the warmth with you.