The batteries are fasten to the cuff of the sock with snap fasteners.
2 ultralight lithium-ion batteries provide warmth up to 14 hours at the low setting.
The 3 heat levels are adjusted by the push of a button on the batteries or with the remote control.
Remote control; Included is a wireless remote control to operate the heat range on the socks. This is a great convenience because the batteries are located at the top of the calf which is usually under your pants making it hard to adjust manually. The remote control can be stored in a pocket or hang around your neck. And if you loose or forget the remote, you can always operate the batteries manually.
Global charger : The global charger has an automatic charging function with an extremely short charging time. The global charger works in North America and in Europe. The charger also has overcharge protection so you don't over charge your batteries and damage them.