Features： 1、Washable: This vest can be hand washed or machine washed after unplugging the mobile power and removing the smart thermostat. 2、3 Temperature Regulation: Blue indicator for 30℃ energy saving gear, white light for 40℃ comfort gear, red for 50℃ warm gear, can be adjusted as needed. 3、Dual Control Switch: Press to start the mobile power, press and hold the key for 3 seconds to turn on the power, press again to switch gears, press and hold for 3 seconds to turn off the power. 4、Outdoor Activity: This heated undershirt is ideal for outdoor activities, hunting, skiing, fishing, motorcycling, camping, hiking, office and more. 5、Lightweight and Comfortable: The heated undershirt is made of lightweight insulating material, which helps you stay warm easily without wearing bulky winter coats all winter long. Specification： Item Type: Intelligent Electric Warming Vest Material: Polyester fiber Color: Blue Applicable: Daily routine for the elderly, overtime protection against cold, female protection, street work, cold winter travel, outdoor duty Package List： 1 x Intelligent Electric Warming Vest