Upgrade electric smart airbagOne tight and one loose, one charge and one release, automatic cycle massage, uniform and comfortable and adjustable strength, no hard object feeling, artificial kneading, enjoy massage at homeMultifunctional knee physiotherapy instrument:Three levels of hot compress, strong squeeze, three kinds of vibration, regular massageHelp relieve knee pains associated with chronic joint painAid in knee injury or surgery recoveryLeg or arm muscle fatigue soreness, cramps reliefProduct parameters:Product name: knee pad massagerProduct material: OK fabricProduct size: 62*21*3cmRated voltage: 12VPower supply mode: rechargeableFunction: infrared physiotherapyControl method: mechanicalProduct color: blackThank you for your patronage. I sell products with integrity. If you have any questions, please contact me in time. We will solve it for you within 24 hours. If you like my product, please give a good review, thank you.