Features:Fast-heating electric knee pad: heats in seconds, provides ultra comfy hot therapy for knee arthritis pain relief and injury recovery, keeps knee warm, can also be used on calfs, thighs, arms to relieve muscle soreness and cramps. Supper comfortable for use.1 button control and 3 heat-settings: very easy to operate, you can control the heating temp and time totally by yourself. The power button with LED indicator, it can be operated to red-highest, white-medium, blue-lowest temp setting. Short press the button for once can change to another heat setting.Adjustable and stay in place: two bifurcate straps design, hook and loop closure, the heating pad can wrap around and be locked at any leg or arm positions where you need heat compress, you needn't hold it by hand any more. With a built-in mash bag, put a ice bag in, you can use it for cold therapy if need be.Comes with 1 USB cord: the USB cord is for portable use, it can be pluged in any power supplies with usb port, such as power bank, PC, laptop, desktop computer, car charger.Travel size and long power cord: this knee electrical heating pad is portable, easy to put it in your suitcase or handbag.The power cord is about 6.6 feet (2 meters) long enough to allow you move freely when connect it to a socket. Fits a leg or arm circumference less than 21inch.Specifications:Material: Breathable Neoprene Material3 heat-settings: red-highest, white-medium, blue-lowestSize: 59*21.8 cmPackage included:1 x Knee brace support1 x USB cable