【2-in-1 Magnetic Design】With unique magnetic design, easy to use, the pocket handwarmer can be divided into 2 3000mah hand heaters. The reusable hand warmer has double-sided heating function, which releases heat quickly and can heat both sides in 3S to warm your hands. Outer beetle design, the structure is compact and smooth, providing comfortable touch. 【Easy Usage Steps】1) Press and hold the button more than 2 seconds to turn on/off the handwarmers. 2) The red light on means it is working, then press the button once to increase one heat level each time. 3) Double-click displays the battery power while working (the white light is on), and the heats level display will resume after 4 seconds. Three-level battery indicator: one white light is 35%, two white lights are 70%, and three white lights are 100%. 【Longtime Warmth】There are 3 temperature modes available: Low 42°C (working time about 12 hours), Medium 48°C (working time about 8 hours), High 55°C (working time about 6 hours). This portable hand warmer insists on constant temperature, double-sided warmth, offering you warmth all day in cold winter. 【Upgraded Protection】Rechargeable hand warmer has built-in over-current, over-voltage, over-temperature, short-circuit protection and other multi-function protection circuits, intelligent security, explosion-proof. When charging, the battery white light indicator flashes from low to high, and the white light is always on when fully charged. If the usb hand warmer is not used for a long time, charge it at least every 3 months to ensure the battery performance. 【Ideal Gift for Your Family】Pocket heaters are suitable for warming hands, feet, abdomen, waist, knees, etc. in low temperature environments, suitable for the elderly, children, outdoor and office workers. The electric hand warmer is the best gift for friends and family, especially in winter. 【Portable Pocket Warmer】Lightweight and small, our electronic hand warmers can be easily slipped into your pockets or tucked into your gloves. You can also carry it with you to warm your hands or body when doing outdoor sports, fishing, hiking, camping, skiing, traveling and other activities in winter. Features: It adopts high-quality ABS+PC and aluminum alloy shell, which is resistant to high temperature, wear and corrosion; the mini body shape fits the natural curve and fits the palm of the hand; the edge design of the appearance is rounded, the structure is compact and smooth, and the touch is comfortable. Press and hold for more than 2S to turn on and off the machine, press and hold to turn it on, and then press it to increase one gear each time, double-click the battery display, and press and hold for more than 2S at any time to turn off. The battery level indicates that one white light is below 35%, two white lights are below 70%, and three white lights are below 100%. When charging, the battery white light indicator flashes from low to high, and the white light is always on when fully charged. No external output discharge function. It is suitable for warming hands, feet, stomach, waist, knees, etc. in low temperature environment. It's an ideal winter warm gifts, especially suitable for the elderly, children and office workers. The built-in battery has a long battery life and provides you with long-term heating in the cold winter. Aluminum heat dissipation heating method, heating quickly and evenly, warm without scalding the skin, and lasting heating. Adjustable temperature: 42°C (low temperature), 48°C (midle temperature), 55°C (high temperature) can be adjusted at will to meet heating needs. This hand warmer is small and lightweight so you can take it anywhere without stress. Built-in over-current, over-voltage, over-temperature, short-circuit protection and other multi-functional protection circuits, intelligent safety explosion-proof.