Product name : Plug-in heated knee pads (single) Product material: diving fabric Product color: black 1. When using USB to plug into the USB port to get power, the output is about 5V/DC: High (red): The temperature is 50 , high temperature, can be used for a long time; Medium (white): The temperature is 45C, warm and can be used for a long time; Low (blue): The temperature is 40C, neither too cold nor too hot, and can be used for a long time. PS: If you connect it to a power bank with an output current higher than 500mA, the temperature may be higher than the above. Product Size : 1. USB product size: 25*16*3cm 0.194kg Packing size: 14.8*11.8*9cm 2. The USB cable is 2 meters long; the adapter cable is 1.75 meters long 3. Size of mesh bag: 18*13.5cm (can hold moxibustion bag, ice pack, etc.) Features : 1. Relieve knee pain related to arthritis, bursitis, strain, sprain, and meniscus tear; 2. Built-in mesh bag, which can be put in an ice pack for cold compress, or a moxa bag for moxibustion; 3. Adjustable and fixed in place, two bifurcated straps design, hook and loop closure, can also be used on calves, thighs, arms to relieve muscle soreness and cramps; 4. 1 button control and 3 heat settings, very easy to operate, can fully control the heating temperature and time; 5. The USB cable is for portable use and can be plugged into any power supply with a USB port, which is easy to use; 6. This knee electric heating pad is portable and easy to put in a suitcase or handbag, if you need 1 pair, please buy 2