The clothes have a USB interface, please bring your own power bank. Our package does not include a power bank. Three temperature adjustable: 25 , 35 , 45 SIZE CHART: M: chest 106cm, shoulder 40.5cm, neck circumference 52cm, back length 64.5cm; L: chest 110cm, shoulder 42cm, neck circumference 52cm, back length 66.5cm; XL: chest 114cm, shoulder 43.5cm, neck circumference 53.5cm, back length 68.5cm; 2XL: chest 118cm, shoulder 45cm, neck circumference 53.5cm, back length 70.5cm; 3XL: chest 122cm, shoulder 46.5cm, neck circumference 55cm, back length 72.5cm; 4XL: chest 126cm, shoulder 48cm, neck circumference 55cm, back length 74.5cm; 5XL: chest 130cm, shoulder 49.5cm, neck circumference 56.5cm, back length 75.5cm; 6XL: chest 134cm, shoulder 51cm, neck circumference 56.5cm, back length 76.5cm; Fit and LightweightThe heated vest features waterproof fabric and Quality cotton, Both heat preservation and water resistance, to keep you warm and dry outside. The non-conductive carbon fiber heating flat means you can fold at will. Giving it to your lover, friends, children, parents as a holiday gift. Let love turn into warm to protect you from the severe cold of winter. Multi-scene and Convenient: This men's vest is thin and lightweight enough for you to wear under your winter coat outdoors. You can wear it on skiing, watching athletics, hunting, cycling, fishing, climbing, skating and other activities you like.