ororo Women&rsquo;s Inner/Bottom Heated Vest with 4400mAh Battery Imported Provides Heat to Three Core Areas, Front and Back Far Infrared Heating Element Made by Carbon Fiber. Soft, Fast Heating Up and Fully Machine Washable. Designed for All Age and All Dress Style. Best Choice for All Age at Any Time under Your Outwear Power Provided by Your Own 5 Volt/2A USB Portable Power Bank(NOT Included) Light Weight Only About 350g.