SOOTHE ACHING JOINTS WITH MASSAGE AND HEAT. No need to hold this massager in place – its unique design wraps around your knee, elbow or shoulder, providing targeted gentle vibration plus soothing infrared heat to help ease pain fast. 3 timer settings. Choose vibration, heat or both. Rechargeable. UL listed. One size fits most. Adjustable hook-and-loop closures for a custom fit. Includes 22” long extension strap. Nylon/polyurethane/elastane.