A. Relieve knee pain: You can use the Heated Knee Brace in seconds like a regular knee brace to provide relatively comfortable hot therapy for knee arthritis relief and injury recovery. It may also stimulate blood circulation and improve circulation in the knee. It can also be used on calves, thighs, arms to relieve muscle pain and cramps. B. 1 control knob and 3 heat settings: It is quite easy to use. You can control the temperature and heating time on your own. The power button has an LED indicator. The USB heated knee support can be used at red/white/blue/lower settings. Briefly pressing the button can cycle through another heat setting. C. Available in several occasions: It comes with a USB power cord. You can enjoy warmth and blood circulation on many occasions, whether you are walking or working in the office. Short pressing the button can change the temperature: red, blue, medium or green - low to relax the shoulder muscles and potentially accelerate healing time throughout the day. (Note: use a 5V adapter or mobile power supply, not included). D. Knee pad for ice pack: It has a built - in mesh pocket where you can insert an ice pack or herb bag for therapy. If you have acute sprains and other soft tissue injuries, it is advisable to apply low body temperature cold therapy first, and then use hot therapy after 48 hours to promote recovery. Note: ice pack not included. E. Lightweight and adjustable: Made of lightweight, breathable neoprene, the heated knee pad is adjustable to fit most people. The heating pad can provide needed heat and relieve pain. It fits left and right knees for men and women. It is a suitable gift for the elderly.