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Stay warm with the ThermoTrek hand warmer. The 44 mAh lithium ion battery provides up to an impressive 6 hours of continuous heat on a full charge and heats up quickly and reaches a maximum temperature of 113 degrees Fahrenheit (45 degrees Celsius). Unlike chemical hand warmers, ThermoTrek can be recharged multiple times. Just plug it into the USB port on your PC or AC charger using the included cable.