Constructed with an insulated quilted nylon shell to help insulate the body's core and a bonded polyester softshell fleece with spandex for a stylish, women's fit. The Radiant Vest will become your perfect companion for those early morning walks. Features: As with all of the Voltheat.com products, the lower the heat setting you are on, the longer the battery will last.Includes one VB560 5v 6000mAh USB powerbank battery and charging cable that provides soothing heat on high for 2+ hours and 5+ hours on the lowest setting Safe & Durable 5v Heating Technology developed and patented by Volt Heated Clothing Machine Washable External push button Bluetooth controller switch with 3 power level settings SUPERIOR HEATING: The Radiant Heated Vest is designed to provide deep penetrating heat to your core to help you maintain thermal comfort. Wear it as a stand alone vest or a mid-layer to help you keep extra warm on those extreme cold weather days. The Radiant Heated Vest features a four zone heating system that targets both sides of the chest and the upper/middle back between your shoulder blades. The patented Zero Layer Heat System provides optimal heat transfer, helping the heat to penetrate deep in to your body's core for a superior warming experience. BLUETOOTH TECHNOLOGY: Built with 3 level external silicone switch with Bluetooth capability the user will be able to easily change heat settings and visually confirm which setting the jacket is on. Download the Volt Heated Clothing app and use your mobile device as a remote to choose your desired power level setting or manually press the controller switch to select you desired heat output. MACHINE WASHABLE: The Volt Heated Radiant Vest is machine washable as long as you remove the battery before washing. Our patented heating system is completely waterproof and used a weatherproof USB reversible plug. Patented Zero Layer heat system eliminates bulk while providing more efficient heat transfer. Volt Heat Women's 5V Radiant Heated Vest with Bluetooth Therm Controller