Volt Heat Empire Heated Vest The Empire Vest by Volt is powered by a rechargeable 5V USB battery. Feel the heat with 4 zones, 1 in the middle of the back, 1 at the lower lumbar part of the back, and 1 on both sides of the chest. The Empire is constructed out of a tough yet warm wool/poly blend shell fabric with a comfortable nylon lining. The Volt Empire Heated Vest by Volt includes the Volt VB560 rechargeable battery and USB charging cord. Charge the battery, plug it into the vest, then choose between 3 heat settings. The Volt Zero Layer heat system helps eliminate bulk while providing more efficient heat transfer than any other heating system available. The Empire Vest is rugged enough to be worn in the woods and stylish enough for a jaunt around town.  Use any properly rated (minimum 2 amp output) USB battery or power bank to power the Empire Vest. Features: Includes one VB560 5V 6000mAh USB power bank rechargeable battery and charging cable Push-button controller switch with 3 power level settings 50% wool 50% poly blend fabric shell Nylon lining 200 grams quilted insulation Provides soothing heat on high for 2+ hours and up to 6 hours on the low setting Large four-panel heating system (2 zones on the chest and 2 zones on the upper and lower back) Ultra-thin stainless steel heating wires permanently bonded to the lining fabric Zippered chest pocket, hand pockets, and interior pocket Front zipper closure Zero Layer heating system Volt Heat Empire 5V Wool Heated Vest