1. Suitable for both left and right shoulders. The heated shoulder strap has an adjustable size: chest circumference 27.55 inches, arm circumference 9.16 inches. The flexible strap ensures maximum comfort. The shoulder compression sleeves are designed for both men and women. 2. The shoulder strap of the heated shoulder straps helps relax muscles and provides super comfortable warmth for your shoulders. The electric shoulder strap support is an care tool for frozen muscles. It has a wireless adjustable design and can be used anytime whether working or sleeping. 3. LED temperature display and battery warning. The LED temperature control allows you to select the most comfortable heat level. The LED display shows the battery level, and when it drops below 5%, a beep will remind you to check usage time and recharge promptly. 4. Suitable for both left and right shoulders. The heated shoulder strap has an adjustable size: chest circumference 27.55 inches, arm circumference 9.16 inches. The flexible strap ensures maximum comfort. The shoulder compression sleeves are designed for both men and women.