Features： 1、IMPROVE KNEE PROBLEMS: This heated knee brace offers 3 levels of heating mode to help people reduce knee problems such as muscle aches and joint pain, strains and sprains, and swollen joints. 2、PROMOTES RECOVERY: Heated knee brace can effectively help recover runners from knee sprains, reduce exercise stress and sports related injuries for people with mild osteoarthritis. 3、COMFORTABLE MATERIAL: Made of carbon nanofibers and neoprene, it is lightweight, breathable and comfortable to wear, thus making it an ideal way to recover and reduce knee pain. 4、ADJUSTABLE DESIGN: You can adjust the size of the wrap and keep it in place, ideal for small or large knees, most people can use the product, especially for the elderly. 5、BATTERY TYPE: Our heated knee wrap has a built in DC interface battery compartment. 4pcs AA batteries are required for each battery compartment, and a total of 8pcs AA batteries are required. Customers need to prepare their own batteries. Specification： Item Type: Heated Knee Brace Heating Material: Carbon nanofibers, neoprene Battery Type: Single battery compartment needs to install 4 x AA batteries, total of 8 x AA batteries (shipped without batteries) Package List： 2 x Heated Knee Brace 2 x Battery Compartment