A rechargeable knee massager is a portable device that uses heat and vibration to relieve knee pain, stiffness, and swelling by improving circulation and muscle tension. These devices are often cordless, powered by a USB-rechargeable battery, and feature multiple intensity levels for both heat and vibration, which can be used together or independently. Many are designed to be adjustable and wearable, providing a comfortable fit for knees, elbows, or shoulder
