Product parametersUSB input voltage: 5V/DCAdapter input voltage: 7.9V/ACGear temperature: the third gear (blue light) USB temperature is about 38 ;The temperature of the third gear (blue light) adapter is 40-45;The second gear (white light) USB temperature is about 41;The temperature of the second gear (white light) adapter is 46-55;The first gear (red light) USB temperature is about 45;The temperature of the first gear (red light) adapter is 56-65.Light Temperature: White Light: Temperature Range 40C/104F to 50C/122FBlue light: temperature range 50/122 to 60/140Red light: Temperature range 60C/140F to 70C/158FNote: Different measuring instruments and measuring positions will have an error of 2-4C Product size: USB/OP bag 24*15*4cm 0.25kgAdapter/OP bag 24*15*4cm 0.35kgPacking size: 51*44*42cm 16.7kg 42pcsFeatures:The built-in heat pad warms the shoulders, promotes blood circulation, and relieves pain such as shoulder soreness. It can also help relax the shoulder muscles and speed up the healing time.Two-way high-quality plastic ring design, can be used for two-way adjustment on the left and right shoulders of men and women. The extended straps fit bust sizes from 27 to 55 and arm sizes from 9 to 16. Mesh bag size: 5''*7.5''Comfortable and durable - 2m charging cable keeps range of motion restrictions to a minimum. Breathable and lightweight neoprene relieves discomfort. Thermoregulation provides warmth but still allows air to circulate.The shoulder rest can also be used as a compression shoulder rest. Do not wear in high temperature for more than 5 minutes to avoid burns. Moderate temperature (white light) is recommended.Package contains partsShoulder strap*1 Adapter*1