Details Innovative surround air bag design,through the front,up,left,right,quar-tet massage,3 levels of pressure mas-sage,suitable for different knee injuryusers. Multi-frequency vibration massage torelieve the pain and weakness ofthekneejoint,promote blood circulationand make the knee joint more re-laxed. Witha large area of hot compress and2levels temperature adjustable,kneejoint can quickly feel the heat,relieveknee pain and accelerate blood flow. There are 3 types of massage to bringyou different massage experiences - soothing mode,pushing mode andpress mode Multi-position use - Knee massager, leg massager, arm massager. Intelligent digital display - Simple 4button operation,built-in key voicebroadcast,the elderly can also easilyuse.