Specification:Name: Smart Heating VestStyle: sports outdoorFabric: nylonSpandex lining: 100% polyester fiberInput voltage: 5VWash method: machine wash or hand washUse 5V/2A mobile power supply (not included)Features:1,Heating: 4/8/9 places heating, more options to you. cover body well, make you no longer cold in winter.2,3 Temperature Settings: 3 temperature settings, low temperature, medium temperature and high temperature.3,Light Weight: Lightweight, waterproof and worry-free.4,Comfortable and Skin-friendly: Heat-gathering constant temperature system, reduce generation of static electricity. The light and soft velvet is matched with quilted stitching, comfortable and skin-friendly. 3600 cycle locks the temperature to gather heat to keep the temperature and maintain good condition.5,Machine Washable: Machine washable and hand wash, suitable for cold winter. The product needs to be connected to a mobile power supply to generate heat.Notice: The package does not include portable battery.Packing List:Heating Vest*1