Fast, adjustable warmth that fits in your hand and doubles as emergency power. Key benefits Instant heat when you need it: warms up within 5 seconds and offers three temperature settings so you can choose gentle comfort or higher heat for very cold conditions. Even, all‑around warmth: dual heating surfaces deliver consistent heat on both sides, reducing cold spots and keeping hands warm faster. Emergency USB power bank: built‑in USB output charges phones and other small devices when you're away from power, useful for emergencies or long days outdoors. Truly portable: palm‑size, lightweight ergonomics slip into pockets or gloves for on‑the‑go warmth without bulk. Durable and safe: constructed from aluminum alloy and ABS for efficient heat conduction and a comfortable feel. Integrated safety protection maintains stable temperature control and safe charging. How it solves common problems Cold fingers on the commute: provides quick, adjustable heat in seconds so you arrive warm and focused. Long outdoor days with limited power: both a heat source and a backup USB charger for essential devices. Bulky hand warmers that don't fit: slim, pocketable design avoids bulk while delivering effective warmth. Practical use scenarios Commuting and daily errands: tuck it into a coat pocket or glove for fast warmth while walking, waiting for transit, or cycling. Outdoor recreation: camping, hiking, skiing, and fishing benefit from dual‑sided warmth and the ability to charge a phone or small device. Emergency preparedness: keeps hands warm during power outages and provides USB charging for essential communications. Specifications and compatibility Heats within 5 seconds with three adjustable temperature levels. Dual heating surfaces for even warmth on both sides. Functions as a USB power bank for charging phones and small USB devices. Palm‑size, lightweight, pocketable design. Built from aluminum alloy and ABS with built‑in safety protection for temperature and charging stability. Simple to use, reliable in cold conditions, and convenient to carry — practical warmth plus emergency power in one compact device.