s: Fast-heating electric knee pad: heats in seconds, provides ultra comfy hot for knee arthritis relief and injury , keeps knee warm, can also be used on calfs, thighs, arms to relieve muscle soreness and . Comfortable for use Function of the knee heating pad: Relieve knee pains with arthritis, bursitis, strains, sprains, ACL PCL meniscus tear Aid in knee injury or surgery Leg or arm muscle fatigue soreness, relief Knee warm keeping Other situations that need hot compress Cold :(ice bag is not included) The heating pad has a built-in mesh bag (13.5 x 18cm), if need, put a ice bag in, it can be used for cold compress. Heat setting temperature parameters for reference: 1. When use the USB cable to plug in an USB port of desktop computer to source, the output is about 5V/DC: Highest (red): the temp is .2/44, hot, for long time use. Medium (white): the temp is 105.8/41, warm, for long time use. Lowest (blue): the temp is 100.4/38, lukewarm, no need to use this setting. PS: if you connect it to a power bank with an output current higher than 500mA, the temp can be higher than the above measurements, and you can more heat. 2. When use the AC adapter, the fixed output is 8.5V/DC: Highest (red): the temp is 149/65, supper hot and heats in seconds, 10 mins later you may need change to a lower heat setting. Medium (white): the temp is 131/55, hot, 30 mins later you may need change to the lowest setting. Lowest (blue): the temp is 113/45, warm, for long time use and temp buffering. Colour: Black : cloth Package Contents: 1 x heated knee pad 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.