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110 true red, three-core 660nm LED beads; 2 shoulder straps, each 1 m longBattery capacity: 5000mAhVoltage: 3.7VCharging time: approx. 3 hoursBattery life: over 85 minutesCharging input: 5V 2A USBPower cord length: 1 mFeatures:Relieves shoulder pain, pain from frozen shoulder, and shoulder discomfort. Provides large-area heat and vibration massage. Includes two 1-meter straps with double-sided adhesive backing and fasteners at both ends, suitable for people of all body types.110 red light LEDs 55 genuine 660nm red light LEDs on each side provide extensive coverage of the shoulders, offering relief to both sides. The product automatically shuts off after half an hour of use by default; the indicator light illuminates on the side currently in operation.There are 6 heat settings: 40, 45, 50, 55, 60, and 65 degrees Celsius. Press and hold the “Temperature” and “Massage” buttons to toggle between Celsius and Fahrenheit; both temperature scales can be displayed.With a total of four motors and 6 massage intensity levels L1, L2, L3, L4, L5, and L6 it offers six different massage modes.