Max 12Hrs Long-Lasting Warmth hand warmer is equipped with 9000mAh battery with maximum energy and minimum weight, with USB-C charging port ensures provide up to 6-12 hours of heat. It can be used not only for winter heating, but also to save your phone/tabletthat is running out of power. Multi-Protection, Warmth of Mindelectric hand warmer is made of aviation-grade aluminum and ABS high-strength alloy fireproof material, built-in intelligent chip protection, with overload, overcurrent, overcharge, overvoltage and short-circuit protectionfunctions, safe to use, suitable for young people, the elderly and children. Instant Warmth & Balanced Thermal Conductivityrechargeable hand warmer with dynamic heat balance technology, rapid heat transfer, rapidly warm-up in 3 seconds, uniform double-sided heating. Ergonomic Design and Mini Size reusable hand warmer shape curve natural, the surface coating delicate treatment, soft and smooth touch, enjoy the smooth warm feeling. Mini size compact and portable, handy to put in your pocket without burden, is yourwinter warm partner. Suitable for sporting, fishing, hiking, camping, skiing, travel, or playing sports outdoors. Quick Charge and Smart Digital Displaybattery hand warmer with USB-C charging port which makes charging 2 times faster than conventional chargers, fully charged in 3-3.5 hrs. With intelligent digital display, the temperature and power is clearly visible,giving you the warmth is obvious.