Thermacell, Rechargeable Insole batteries. 1 pair.
You can never have too much warmth in the winter—one fully charged set of batteries is good, but two are better! With the ProFLEX Battery Pack you can face those frigid temperatures without fear of turning back. Your feet will thank you.
Package Includes: 2 rechargeable lithium-ion polymer batteries, 1 USB cable, 1 wall charger, 1 smart charging case.
Features: Charge lasts up to 5 hours. Batteries charge in 4 hours or less. Use wall charger or any USB port to charge. Wall charger wires disconnect, become carrying case for batteries.