Features： 1、Fast Heating: The knee heating pad heats up quickly in seconds, providing comfortable heat therapy for knee arthritis pain and injury recovery 2、3 Levels Heating: The self heating knee pads have one button control and three heating settings for easy control of heating temperature and time 3、LED Indicator: Power button with LED indicator can switch to red, white medium, blue minimum temperature settings. Switch to another heat setting with a short press of the button 4、Split Shoulder Straps: The support knee pad brace features two split shoulder straps design, with hook and loop closure, heated pads can wrap and lock in the leg position where you need to relax 5、Scope of Application: The knee heating support can keep the knee warm and can be used for calf, thigh, arm to relieve muscle pain Specification： Item Type: Knee Heating Pad Material: OK Cloth Product Size: Approx. 51 x 22cm / 20.1 x 8.7in (there is a 1 to 2cm/0.4 to 0.8in error in manual measurement) Scope of Use: Enhance Blood Circulation, Can Also Effectively Relieve Knee Pain and Muscle Stiffness Package List： 1 x Knee Heating Pad 1 x USB Cable