Electric Infrared Heating Knee Massage Air Pressure & VibrationFeature It combines red light therapy , low level laser therapy, kneading massage(Air pressure & Vibration) and far infrared heating therapy into one device, to ensure the good treatment efficiency. Imitate artificial massage: 4D airbag wrap, relax knee soft tissue, by squeezing the knee around the airbag. Automatic filling and relaxation to achieve the effect of massaging the knee The battery capacity is 2600 mAh, fully charged in 3 hours, it can be