Feature 1. Built-in mesh bag, can be put into ice pack for cold compress, moxa stick bag for moxibustion; 2. Adjustable and fixed in place, two bifurcated straps design, hook and loop closure, can also be used for calves, thighs, arms to relieve muscle soreness and cramps; 3. 1 button control and 3 heating settings, the operation is very simple, you can fully control the heating temperature and time; 4. The USB cable is portable and can be inserted into any power supply with a USB interface, which is easy to use; 5. This knee heating pad is portable and easy to put in a suitcase or handbag, 6. Relieve knee pain associated with arthritis, bursitis, strain, sprain, meniscus tear Specification 1.Material: diving cloth 2. Color: black 3. Product size: 25*16*3cm 4. The USB cable is 2 meters long; the adapter cable is 1.75 meters long 5. Size of mesh bag: 18*13.5cm (can hold moxibustion bag, ice pack, etc.) TIP 1. When using USB to plug into the USB port for power, the output is about 5V/DC: Highest (red): The temperature is 50, high temperature, can be used for a long time Medium (white): The temperature is 45, warm and can be used for a long time The lowest (blue): the temperature is 40, neither too cold nor too hot, it can be used for a long time If you connect it to a power bank with an output current higher than 500mA, the temperature may be higher than the above. 2. When using the adapter, the fixed output is 7.9V/DC: The highest (red): the temperature is 65 , high temperature, the recommended use time is 10 minutes; Medium (white): The temperature is 55C, which is relatively hot, and the recommended use time is 30 minutes; Lowest (blue): Temperature 45, warm and can be used for a long time.