Feature: 1.Soft and breathable, not easy deformation, adjustable three temperature levels. 2.Quick heating, energy saving, long service time. 2.Activates various functions of skin and promotes metabolism. 3.Help to warm the human body, consumes excess heat, increases blood oxygen and fluidity. 4.Provides deeper adjustment of physiological functions to avoid sub-health state and restore the vitality. 5.Improves body's microcirculation, activate the meridians, eliminate partial pain and inflammation.   Specification: Color: black, gray Material: polyester, carbon fiber Temperature level: Low: about 45℃ Mid: about 55℃ High: about 65℃ Gender: unisex   Instructions for use: 1. Vest features built-in USB port to connect the power bank. 2. Power switch - long press the switch for 3 to 5 seconds. 3. Red light flashes - automatic heating 4. Red light - manual heating, high temperature 5. White light - medium temperature 6. Blue light - low temperature   Package Content: 1*Heated vest(Does not include charging treasure) 1*USB cable   Note: 1.All pictures are professionally color-coded, but due to the different ambient light and different display device settings, there may be some deviations between the pictures you see and the items themselves. Please understand. 2.The data is measured manually, there may be some deviation, but it does not affect the use. Please kindly note that our sizes are Chinese sizes, which are usually smaller than US & Europe sizes. Please choose your size according to size chart and we suggest one or two sizes bigger to match US & EU size.