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Upgraded Security Built-in intelligent protection system to protect the warmer from overcharging, over discharging, over voltage, over current, over heat and short circuit. Smart temp control system built an integrated temperature sensor will switch off automatically when the temperature exceeds 149℉. Exquisite Comfort Pebble shape and small volume allow you to put it anywhere you want, hold it in your hand or put it in your pocket. Smoothy Warm Surface Double-sided and consistent warmth, keeping your hands cozy and won't hurt your skin. Winter Gift Perfect winter gifts idea for your family or friends. Fitting for outdoor sporting, fishing, hiking, camping, ski. Specification: Material: Aluminum+ABSmaterial +Lithium Battery Battery Capacity:10000mAh Input/Output: 5V/2A Product Size: 4.4*2.5*1.35 in (L*W*H) Product G.W.: 7.0 OZ(200g) Charging Time: 3 Hours Working Time: 5-12 Hours 3 Heating Modes LED Temperature Show PACKAGE: 1 x Hand Warmer 1 x User Manual 1 x USB Cable 1 x Cloth Bag NOTE: Please do not charging and heating simultaneously. It is impossible to charge the equipment when heating.