Double-sided rapid heating. Includes 1 hand warmer, 1 USB charging cable, and 1 portable cloth bag. The rechargeable hand warmer features a double-sided heating design that heats up in 3 seconds. Offers 3 adjustable temperature settings: 104113F (4045C), 113122F (4550C), and 122140F (5060C), providing warmth for hands during cold winter months. 10,000mAh large capacity. Modern design with a USB charging port, upgraded high-capacity battery provides continuous heat for 610 hours. Sufficient power to charge electronic devices multiple times, making it an ideal portable power source for travel. Lightweight and smooth surface. Compact size (112 x 64 x 33mm), comfortable and easy to hold. Safe, smooth heating surface. Convenient to carry during outdoor activities such as sports, fishing, hiking, camping, skiing, traveling, or other outdoor recreation. How to use and important notice: Press and hold the power button for 3 seconds to activate heat. Single click to turn on flashlight, double click to display battery level, triple click to activate vibration function. Can be used to warm hands, waist, stomach, feet, and knees in cold environments. Do not charge and heat simultaneously. Keep away from water and fire. Avoid direct skin contact when device is hot to prevent burns. Great gift choice. Ideal for loved ones. Suitable for use in low-temperature environments. For any questions regarding your purchase, please reach out to customer support.