Features: Multi-function knee massager can relieve joint pain, arthritis, cramps and meniscus pain. And you can also use it on your arm joint or other painful place. 3 massage intensity can be adjusted flexibly to meet the demands of massage intensity in different states. The heat released by far infrared can penetrate into subcutaneous tissue quickly and effectively relieve pain, with long service life, heating faster and more evenly. 3 temperatures can be adjusted as your needs, 45, 50, 60. The heating function can increase circulation, further relieves muscle soreness and cramps. This knee massager can stop working automatically after 30 minutes, which give you much safer operation. With a 5000mAh built-in lithium battery, it can be used for one week after charging. Specifications: Material: ABS Color: Grey Built-in Battery: 5V 5000mAh Built-in Lithium Battery Package Size: 33 * 18 * 3.5cm / 13 * 7 * 1.4in Package Weight: 470g / 1lb Package List: 1 * Knee Massager 1 * USB Cable 1 * User Manual