ThermaCELL Heat Pack Rechargeable Hand and Pocket Reusable Warmers 100% Polyethylene Imported ThermaCELL Heat Packs are thin, lightweight lithium-ion polymer battery-operated warmers that are rechargeable, durable and will last over 500 charges Simply charge the ThemaCELL Heat Pack via micro USB between uses to keep it ready for the next time you need to take control of the cold Shock resistant, water resistant, and easy to move from jackets or pants with 3 temperature settings reaching up to 116 degrees Fahrenheit Lasts up to 6-hours of constant heat per charge and can recharge in approximately 4 hours Includes: 1-pocket warmers, 1-micro USB wall charger, 1-USB cord