Haomaomao Hand Warmers and 5000mAh Power bank, 2-in-1 function brings warmth into your winter. we always committed to producing high qualityand comfortable electronic product. Small size, but great warmth! Elegant appearance: The exquisite cobblestone design makes it easy to hold in your hand, and the mini size does not add to the burden on your pocket and backpack. Use 2 functions at the same time:When charging external devices, you can still turn on the hand warmer function and beat the products that can only choose a single function on the market! ( Recommendation: Don't often use 2 features at the same time! ) Instructions for hand warmer use: long press the switch key (3s) to enter the warm hand state (display red light), then switch the gear switch by switch button, and then press the button to exit the warm hand mode. Heating level: Low temp - one red light:104~113°F Medium temp - two red lights:113~122°F High temp - three red lights:122~131°F Charging function operation: When the indicator is on (blue), the system is in the charging state. As the capacity increases, the power indicator will rise from 1 to 3. When full, the indicator light (blue) is fully illuminated. Product specifications: ? Input/Output: 5V/2A; ? Charging time: 2-3 hours; ? Working Time: 4-8 hours (depending on whether the hand warmer mode is used) ? Size: 4.09*2.1*1.14 in ? Weight: 4.5 oz Notice: ? Please Keep away from water! ? Please don't often use charging and heating at the same time! ? Please stored in dry place when not in use! After inspection and testing, it meets strict global quality standards. If you have any quality problems, please feel free to contact us, we will reply you as soon as possible and give a solution!