?NOTE: Please don't use on bare skin in case of being burned. We will address any issues with the product. Please feel free to let us know at the first time. ?Knee Heating Pad is portable, easy to put it in your suitcase or handbag. The power cord is about 4.92 feet (1.5 meters) long enough to allow you to move freely when connecting it to a socket. ?1.8m USB Cord: Portable to use, it can be plugged into any power supply with a USB port, such as a power bank, PC, laptop, desktop computer, or car charger, and the heating temp can be various for these power sources with different output currents. The AC adapter with a fixed output 7.9V/1.1A is for quick heating and higher heating temp use. ?Adjustable and Stay in Place: With 2 bifurcate straps design, and hook and loop closure, the heating pad can wrap around and be locked at any leg or arm position where you need heat compress, you needn't hold it by hand anymore. With a built-in mash bag, put an ice bag in, you can use it for cold therapy if necessary. ?3 Heat-settings: Easy to operate, you can control the heating temp and time totally by yourself. The power button with LED indicator, can be operated to RED-highest, BLUE-medium, GREEN-lowest temp setting. Short press the button once can change to another heat setting. ?Fast-heating Knee Pad: Heats in seconds, provides ultra comfy hot therapy for knee pain relief and injury recovery, keeps the knee warm, and can also be used on calves, thighs, and arms to relieve muscle soreness and cramps.