EXQUISITE & PORTABLE DESIGNThe hand warmers made of high-tech aircraft-grade aluminum and ABS material, thousands of polished exterior material, smooth and warm surface, portable and compact as well anti-skid in one hand. Put it in a small bag to take on a day out or hang it on a backpack to keep your phone charged on an adventure RECHARGEABLE HAND WARMERS & POWER BANK The rechargeable Hand Warmers not only a hand warmer but also an emergency backup battery . Built-in substantial 4000mAh rechargeable battery power bank to ensure long lasting. Add 3 kind of port design can charge all smart phones & tablets, more convenience than others. SMART LED DISPLAY & DOUBLE-SIDED HEATINGThe USB Hand Warmer use premium chipset to control the heat levels, rapidly warm up double sides in seconds, the heating area covers the entire aluminum surface, larger than others. MULTIPLE PROTECTION & SUPERIOR SAFETYSafety is our priority, Hand Warmers Heater adopted premium battery cell provides multiple protection: short circuit protection, over-power protect, over-current protection, over-charging protection, over-heating and over-discharging protection. Batteries adhere to the highest quality standards and many more advanced safety features to give you peace of mind. PERFECT GIFT IN WINTER Hand warmers with Perfect gift package, includes rechargeable hand warmer, micro usb cable, user manual and great after-sales service. Great gifts for camping, fishing, cycling, motorcycling and skiing, travelling and working remotely. Best gift on Christmas, Birthday, Thanks Giving Day, Valentines Day in cold winter.