Built for cold weather comfort: Sturdy aluminum alloy body with a silicone exterior provides durable protection and a comfortable, nonslip grip. Compact enough to carry in a pocket or glove compartment so you can warm up quickly when temperatures drop. Dualpurpose power: Builtin 10,000mAh rechargeable battery heats both sides of the unit and also works as a mobile power source to recharge phones and other small devices while you are outdoors. Stay warm and stay connected without carrying extra batteries. Fast, lasting heat: Heats up in seconds and delivers continuous warmth for approximately 3–8 hours depending on ambient temperature. Twosided heating helps keep both hands warm or delivers targeted heat where you need it most. Designed for everyday outdoor use: Ideal for golfing, fishing, hiking, camping, skiing, outdoor work, and commuting. Lightweight and pocketfriendly so it's easy to take along on any activity. Comfortable, reliable handling: Nonslip silicone surface and ergonomic shape give a secure, comfortable hold during use. The aluminum alloy core adds durability and efficient heat transfer. Thoughtful gift option: Features a cute deer design that appeals to women, teen girls, and kids—an attractive, practical present for birthdays, holidays, or winter outings. What you get: A rechargeable hand warmer with a 10,000mAh battery, twosided rapid heating, durable aluminum alloy and silicone construction, nonslip grip, and a pocketfriendly form factor for portable warmth and emergency power.