Fever Knee Massager for legs and knees Do you often walk long distances or do extra exercise that causes your knees to hurt? Now you can deal with this by using a knee massager. This massage device will emit heat for relaxation and will help solve various knee problems such as arthritis, weak knees, aches, pains and swelling. You can massage your knee pain without putting any extra effort with an electric knee massager. This instrument will produce heat, so it can properly massage the acupuncture points on the knee, relax and treat health problems in the knee. You can use it while relaxing or doing light activities.