The Mobile Warming 7.4-volt Heated Glove Liners are designed to fit under any glove. Engineered with high-quality stretch polyester, the Mobile Warming Heated Glove Liners are ultra-thin, but provide long-lasting warmth. A set of ultra-slim, 7.4-volt rechargeable Lithium-Ion batteries provide exquisite heating power. The integrated light-weight batteries give you maximum comfort and long-lasting power. Adjust temperature easily with an integrated touch button controller in-cuff. Choose from four different temperature ranges to ensure you can find your perfect temperature. Includes: (1) Pair 7.4v Glove Liners (2) 7.4v 2000mAh Lithium-Ion Battery (1) AC Charge Product Specs: Mobile Warming heating elements quickly and evenly distribute heat Includes 7.4v lithium-ion batteries and standard dual charger Stretch Polyester Shell Slim-Fit to Use Under Any Glove Gauntlet Hook & Loop Closure Integrated Wire Harness Connectors 4 Selectable Heat Settings Heat on Outside Perimeter of Fingers 7.4 Ultra-slim Lithium-Ion Batteries Integrated Touch Control Button Split-Pack Batteries to Reduce Wrist Weight Mobile Device Touch Screen Compatible