Made of aluminum alloy, silicone material for durable and practical use. This hand warmer is designed with lovely snowman appearance. But it is safe, effective, . With USB design, It can warm hand in the winter, can be used as portable power source. It's also great present. It's small, delicate and portable. Features - Material: Polycarbonate, silicone, aluminum alloy. - Size: 6.70X8.00X13.50cm/2.63X3.14X5.31in. - Multi-function: Compatible with 99% of the devices with USB charging on the market, such as various mobile phones, MP3, MP4, GPS, digital cameras, etc. - Smart design: It will sleep automatically under non-working condition, preventing power loss. - You can just in the hand, or put it on the leg, belly and enjoy the cozy warmth it brings in the cold winter. - It can use as a power bank to charge your device like cellphone, and it can be a hand warmer for heating your hand, very practical for use. - Rechargeable by USB cable that can be placed in package, allowing you to charge and use it at any time, any occasion. Specification Rated power: 10W. Heating temperature: first grade 47- centigrade/second grade: 55-60 degree centigrade. Heating time: 3-5h. Input/charge time: 5V… 2A/4-5h. Output (mobile power): 5V…2A. Battery capacity: 6000mAh. Battery interface: type-c. Package list: 1 x hand warmer (with )