Jomst Rechargeable Hand Warmers 5200mAh Power Bank,Reusable Hand Warmer,Double-Side Quick Heating,Portable Mobile External Battery Charger,Best Winter Gift (Black)
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How to turn on handwarmer 
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Jomst
{"Item Package Dimensions L x W x H": "6.1 x 3.58 x 1.34 inches", "Package Weight": "0.25 Kilograms", "Item Weight": "0.29 Pounds", "Brand Name": "Jomst", "Part Number": "HZL-H10", "Size": "103x25 millimeters", "Date First Available": "August 29, 2019", "Brand": "Jomst", "Battery Description": "Lithium", "Battery Capacity": "5200 Milliamp Hours", "Reusability": "Rechargeable"}