Includes the 7.4V (2200mAh) Lithium-Ion battery and a micro USB charging cable.
Its moisture-wicking, warmth, and stretch features make it a versatile baselayer in the winter, or a standalone shirt during outdoor activities. There are three heating elements, one on the back and two on the chest. With a simple button push, you can select from four heat settings. The heating system can provide temperatures ranging from 135°F on high to 90°F on low.