Compact, comfortable 5 volt Rechargeable Lithium-Ion Battery USB Charging Compatible (use any universal wall adapter you already own to charge) Up to 8 Hours of Heat Per Charge On Lowest Heat Setting Touch Screen Compatible Waterproof Locking Zippers Experience comfort on a whole new level with our 5-layer constructed, waterproof soft shell, heated glove. A battery powered glove that in seconds provides a constant flow of heat, up to 135ºF. Feel the heat flow from our ultra-thin 5 volt heating system that provides 4 adjustable levels of comfort. Refined, lightweight, and fast charging Lithium-Ion batteries deliver up to 10 hours of heat to crucial zones on your hand. Stop numb knuckles, maintain full control of your hands, while still keeping a grip with a reinforced palm stitching. Features: Compact, comfortable 5 volt Rechargeable Lithium-Ion Battery USB Charging Compatible (use any universal wall adapter you already own to charge) Up to 8 Hours of Heat Per Charge On Lowest Heat Setting Touch Screen Compatible Waterproof Locking Zippers Rainguard Waterproof Lining 300 Denier Poly-Oxford Outer Shell Reinforced Palm 4 Selectable Heat Settings Heat Over Top of Hand & Fingers Integrated Touch Control Button Wrist Cinch Closure System Available XS, SM, MD, LG, XL, 2XL. Consult our Size Chart or refer to the back of your packaging for a physical hand chart.