Let your winter not feel cold! ! ! Come and use our 5200mAh hand warmers, winter hand warmers are made of high quality materials and ergonomically designed, perfect for everyday use, providing continual warmth. Sit down and share the warmth with her on a date, or watch a warm-up ball game, and never miss any outdoor activities because of the cold. Other Reasons To Choose Recargable Hand Warmers Outdoor! ! Handwarmers is very safe and has protection from overheating, overvoltage, overcurrent, etc. Relieve local（Neck, Shoulders, Legs, Waist, Finger, etc.）, menstruation, Raynaud's arthritis, etc. Get out of the cold as you work. (such as outdoor cleaning, sanitation workers, duty, patrol, study, etc.) Stay away from the cold while outside fishing, camping, hunting. Hand Warmers provides 8-15 hours of continuous warmth. 3 heating levels, 3 seconds of double-sided heating. Lightweight and portable, easy to carry. Hand Warmer/Power Bank 2 in 1 How To Use Portable Heaters For Indoors ? Turn on/off: long press the button for 3S to turn on/off. Change the heat: After power on, press the button to change the heat.(Red Light) Remaining battery display: Double-click the button to display the remaining battery.(Blue Light) Reusable Hand Warmers 3-Level Temperature To Meet Different Needs: 95-108F (35-42C) 104-118F (40-48C) 118-131F (48-54C) Different temperatures are suitable for different environments and people. Perfect Gift: Electric hand warmer is a good camping accessory, hunting gear. Hand warmer is an ideal gift for sports lovers, such as hunting, climbing, fishing, golf, camping, skiing, arthritis, muscle, dog walking, raynauds, working, studying, watching football, etc. Perfect for men, women, family and friends as birthday gifts, Christmas, birthday and anniversary gifts and more.