1.Notice:This knee wrap need to be plugged In to use, no battery in the wrap so not retain heat always 2.Made of high elastic neoprene, skin-friendly, lightweight, warm and stretchy material. Adjustble with hook and loop fastner, one size fit most men and women 3.Our heated knee brace has 3 levels adjustable temp of low/medium/High, adjust according to your needs, safe to use, no worry it'll scald kneet. Electric heating will warm your knee and enhance blood circulation reduce knee pressure from the deep 4.Adjustable strap for secure fit: The strap can be flexibly adjusted to ensure that the heated knee wrap are firmly positioned 5.Knee Electric heater with USB cable, it can be plugged in any power supplies with USB port, such as power bank(5V/2A is recommended), car charger, laptop, desktop computer, etc 6.Widely applicable scenarios, convenient to use whether at work, at home, or outdoors. It can also be given as a gift to family and friends