5V/2A USB Charging & Keep Warm For A Long Time Heating Jacket is compatible with any power bank with 5V 2A USB output port. A 5000mAH to 10000mAH fully charged power supply can be heated for up to 16 hours with single control opens and up to 8 hours with dual control opens. (POWER BANK NOT INCLUDED)5 Heating Zones Electric heated vest including 5 carbon fiber heating elements generating heat across collar, back and abdomen for core-body warmth. Heated clothing help promotes blood circulation, warm the your body, consumes excess heat, increases blood oxygen and fluidity in the process of heating. It is a new type of outdoor clothing.3 Heating LevelsWANFEI Heat Body Warmer has two buttons to control the heating area of the back and belly separately. Adjust 3 heating settings (High, Medium, Low) with just a simple press of the button: Red Light (50-55/122-131); White Light (40-45/113-122); Blue Light (35-40/104-113).Lasting Warmth & Overheat ProtectionHeated Gilet are made of carbon fiber, and the internal heating parts are made of spandex, very soft and no radiation.It is very easy to pull and is not prone to breakage. Built-in thermal protection module, when you power on the heating function, it will automatically lower the temperature to WHITE light to avoid the high heat.Surpport Machine Washable Premium Heating waistcoat are completely safe for hand and machine washing. Please remove the power bank and removable connectted usb cable, zip of pocket up before washing, then put the vest into a laundry bag for machine wash.Multiple Usage Women's Heated Vest Lightweight Slim Fit Insulated USB Electric Heating Winter Vest. This heated Warm Waistcoat is perfect for outdoor activities like camping, hiking, skiing, fishing, hunting, office routine and business. Its also a great gift for your family and friends.