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Product information: Material: 100% polyester, stretch fabric, better toughness can protect your knees and reduce the pressure on your knees.Suitable for the crowd: long standing, leg discomfort, office sedentary, knee exposed, athletes.Intelligent battery management system and intelligent induction power off for security.USB interface power supply, 5V safe voltage mobile output, you can use this product no matter where you go, safe and convenient.It is the best gift for friends, family and the elders during the holiday , and they will spend a warm and comfortable winter with it.