Universal fit and adjustable size: Fits left or right shoulders. The heated shoulder strap is adjustable with chest circumference 27.55 inches and arm circumference 9.16 inches. The flexible strap ensures comfort for everyone, and shoulder compression sleeves are suitable for both men and women. Relief and USB charging: The heated shoulder straps help relax muscles and provide warm comfort for the shoulders. It is a practical shoulder care tool for frozen muscles. The wireless adjustable electric shoulder strap features USB charging, allowing you to use it at any time whether you are working or sleeping. LED temperature display and battery warning: The LED temperature display enables you to select the most comfortable heat level. The LED also shows the battery level when it drops below 5, with a beep to remind you to check usage time and recharge as needed. Practical use scenarios: Use at a desk or in an easy chair to relieve shoulder tension during work or study. After workouts or sports to ease muscle stiffness and promote recovery. While traveling, resting, or sleeping to maintain warmth and support shoulder comfort.