VERSATILE: Quick hand warmer & Power bank 2-in-1. It's not only a little handwarmer but also a emergency backup battery. SAFETY & METAL HAND WARMER: Safety is top-of-mind, this mini hand warmer have built-in intelligent protection system is provided with safeguard of power on, short circuit and over loading, etc. Ensured the security of products. Shockproof, Anti-scald, Anti-skid, Explosion-proof, Radiation-free, Green and Healthy heat transfer. This small hand warmer made of premium aluminum and ABS, Eco-friendly lithium ion battery. DOUBLE SIDE HEATED & 4 DIFFERENT HEAT SETTINGS: This cool gadget heat up within seconds. There are three different temperatures (35~38, 38~42, 42~48, 48~55), it reaches the temperature you want very quickly. PORTABLE & LARGE CAPACITY: It is a nice size to hold and feels smooth in your hands. Handy carrying anywhere with any pocket or bag while sporting,fishing, hiking, camping, skiing, travel or play sports outdoors. Also a perfect reusable hand warmer solution in cold weather for a commuter or office worker. 5200mAh capacity can give a full charge to mainstream digital devices on market, such as iPhone X, Samsung Galaxy, other Android phone, and other electronic devices charged via USB cable.