High quality fast heating material: The knee massager is made of * SBP OK fabric, 3MM thermal insulation material, which can keep heat from losing, easy to heat quickly, durable and harmless to human body. Adjustable Velcro for any ageThree heating gears and three vibration gears are adjusted: the knee heating pad has three constant temperatures: 45 ° C/113 ° F, 55 ° C/131 ° F, 60 ° C/140 ° F, which can be adjusted according to your heart. The heating protector is upgraded and added, so that the knee can fully enjoy the massage heating effect brought by the knee massager. Vibration massage and heating knee pads can be used alone or together.Rechargeable rechargeable battery knee thermal massager: The battery of the electric knee pad is 7.4V 6000 MAH, which only takes 2 to 2.5 hours to fully charge, and can work for about 5.5 to 7 hours, saving us a lot of time and experience. Do not operate the plug. Plug is only used for battery chargingDouble therapy of massage and heating: the rechargeable knee thermal massager provides powerful vibration massage, which helps to reduce joint pain, muscle stiffness and joint swelling of knees, shoulders, arms and legs, and improve your range of motion; Advanced optional heating function can promote blood circulation, keep knee warm in a few seconds, and further relieve muscle soreness and crampsIt can be used together with various herbal medicine bags: massage knee pads have a mesh bag designed in the knee pad. You can put the medicine bag into the things you want to treat, such as wormwood herb bag, analgesic herb, link arthritis herb bag, ETC