Specification:Name:USB Heating VestColor: BlackMaterial: 85%Cotton & 15%PolyesterSize: S,M,L,XL,XXL(Optional)Heating level: 45-65Heating zones: 4 zonesPower supply: USBInput voltage: 5VInput current: 1.85APowered by 5V/2.0A power bank is suggested (power bank is not included)Heating level:Green light(Low level): approx. 45 C (10000mAH power bank can keep heating for 5-14 hours)Blue light(Medium level): approx. 55 C (10000mAH power bank can keep heating for 4-11 hours)Red light(High level): approx. 65 C (10000mAH power bank can keep heating for 3-9 hours)Heating zone:Back upper area (10000mAH power bank can keep heating for 9-14 hours)Chest & Back upper area (10000mAH power bank can keep heating for 5-7 hours)Chest & Back upper & middle area (10000mAH power bank can keep heating for 3.5-5.5 hours)Chest & Waist & Back upper & middle area (10000mAH power bank can keep heating for 3-5 hours)Features:3 Levels Temperature Setting, provides temperature from 45 to 65, easy to switch4 Heating Zones, allows switch heating area for generate heat across specified body areasBuilt-in USB port and storage pocket for connecting power bank (power bank is not included).Waterproof electronic element supports hand washing, dry-cleaning, and machine washingWashing Tips:1, Take away your power bank before washing2, Put it into cold water that below 30 C3, Do not twist or wringPackage Included:1 x Electric Vest (power bank is not included)