Accepts 18V BL1815N, BL1830B, BL1840B, BL1850B, BL1860B Li-Ion Batteries. Features 5 heating zones (left chest, right chest, back upper left, back upper right, back center). High/medium/low heat levels for precise heating requirements. Features 6 pockets: (right chest, left chest, left arm, right arm, back waist, inside left chest). 18V battery adapter features USB port to enable convenient charging of mobile devices on the job site. Battery protection system provides over-discharge protection for enhanced battery cycle life and overall battery life. On/off heat controller with LED indication. Battery pocket on rear left side for quick and easy access by wearer. Waterproof and windproof construction for maximum comfort. Fleece lining provides extra warmth even when heating element is turned off. 100% polyester. Machine washable (gentle cycle, cold water) and machine dryable (low temperature only). Detach battery adapter before washing/drying. Includes: Tool Only. Batteries and Charge Sold Separately.