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MASSAGING ON-THE-GO: The built-in 5000mAh lithium ion battery can hold a charge for up to 3 hours vibrating & heating which set yourself free from cords, it is perfect for use in travel, office and anywhere you want to relief your feet. You can always get it recharged by any USB power supply. THE KNEE CARE MUST HAVE: The brace can bring relief for most knee issues, such as knee pain, joint pain, arthritis, knee effusion, soft tissue injury, knee surgery, and knee injury recovery. (If you have illness or operation on your knee, please consult your doctor before use.) 15 RELAXING COMBINATIONS: The brace heating temperatures are adjustable between 113°F / 122°F/ 140°F, and it comes with advanced Graphene Far-Infrared Heating Elements Technology which provides a fast and high-efficient heating than normal heating elements. The 6-14 um infrared band can work with the muscles 5mm under the skin. The brace also provides soft/ soothing/ strong vibration intensities, the vibrations come from high-efficent rotor motor and the vibration power can reach up to 0.35w, it is 3~5 times stronger than normal sheet-motors. The heat and vibration settings are independent and both adjustable that offer up to 15 different relaxing combinations. The brace will automatically shuts off after 30 minutes using to prevent overheating or overuse. THICK & COMPORTABLE TO FIT: The braces are easy to wear and the wraps are adjustable to fit for most people.（Upper thigh circumference up to 48cm, lower thigh circumference up to 45cm), the brace is designed according to the human knee physiological bending, it fits comfortably and tightly. The thickened high-quality Lycra fabric is durable and easy-to clean, also makes a comfortable and safe wearing without rash or skin sensibility.