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NOTE:In the first three times of charging, the battery has not been activated well, so it will works normally after the hand warmer was used three times.Important Tips:1.Please Keep away from water;2.Do not charging and heating simultaneously;3.Please stored in a cool dry place when not in use;4.Put on Cloth pouch to avoid burns when they get too hot for skin contact especially say on the wrists or behind knees where skin is thinner and more fragile.Specifications:Material: pure Imported Aluminum+ Imported flame retardant ABS Material+ Lithium Battery Battery Capacity: 5200mAh;UsingTime: 4-8 hours(It was tested in the 20℃ ambient temperature)Charging time: About 2-3 hours;Weight: 133g(N.W.), 246(G.W.);Product Size: 102*58.8*24mm;Package Size: 150*85*40mm; Package includes:1 X Lanyard;1 X Micro USB cable;1 X Instructions Manual;1 X Cloth pouch with drawstring;1 X 5200mAh hand warmer& power bank How to make it be warm?1.Press the middle button for 5 seconds.2.When the three lights on, reached the highest temperature of about 131°F(55°C).3.Use your hands to make a friction, which can adjust the temperature.