Universal fit for left or right shoulders Adjustable size: chest circumference 27 55 inches; arm circumference 9 16 inches. The flexible strap provides comfort for most body shapes. Shoulder compression sleeves are suitable for men and women. Three modes of heating and vibration Three combined heating and vibration modes with adjustable temperature ranges: Mode 1: 40 50 C (104 122 F) Mode 2: 50 60 C (122 140 F) Mode 3: 60 75 C (140 167 F) Each mode delivers comfortable warmth to relax shoulder muscles and alleviate soreness. Clear temperature display and battery alert LED temperature display helps you choose the most comfortable setting. When battery level falls below 5%, the display shows the low power status. Shoulder relief and USB charging The heated shoulder straps help relax muscles and provide soothing heat for the shoulders. Designed as a convenient shoulder care tool for frozen or tight shoulder muscles. USB charging design enables use during work or sleep. Use scenarios At a desk for long hours to relieve neck and shoulder tension. After workouts or manual labor to ease muscle stiffness and improve recovery. While traveling or resting at home to maintain warmth and comfort. Notes Suitable for both men and women. Adjustable fit accommodates a wide range of body sizes and shapes.