ActionHeat 3.7V Rechargeable Battery Kit for Socks AH-Men-Outerwear Plug-In - Connect the power

Plug-In - Connect the power bank to the USB plug

Plug-In – Connect the batteries to the USB cords located in the pocket on the top of the sock

Cold fingers are just not in the equation

Dimensions: 8

Breathable synthetic fill insulation

ActionHeat 3.7V Rechargeable Battery Kit for Socks AH-Men-Outerwear Plug-In - Connect the powerThe ActionHeat 3V batteries are super slim, sleek, and powerful. They are designed specifically for ActionHeat socks. They fit perfectly into the battery pocket on the top of the socks. Specifications: Lithium Polymer Core Battery Voltage: 3 Volt 1 amp output max Charging Time: 3 4+ hours Battery Care: It is important to maintain at least 25% of your battery power when not in use. Failure to do so may result in performance problems and reduced battery