Come and Check Our Branding Solutions.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. 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. Pls check inventory and detailed info before placing your orders.