Dekinmax Men Womens Heated Vest Lightweight Slim Fit Insulated Usb Electric Heating Winter Vest (Xl)Product descriptionSpecification:Input USB 5.0VRated power: 5.5WRated current:1100mAFever part: collarback Usage method:1. Open your pocket and recharge USB2. Long press 3 seconds to start heating3. Light shift, three gear temperature adjustment4..