Features1Heat Treatments: The Knee massager knee pads are built in heat pads with 6 massage modes that work well for soothing stiff joints and tired muscles and enhances blood circulation. The heating pads with auto shut off function ensure safe use. 2Vibrating Massage: Comfier leg massager with heat has powerful massage motors to deliver soothing massage to tissue muscles. It will be a nice leg massager, knee massager helps to further relax the soreness and muscles. 3Adjustable Straps Keep in Place: The adjustable hook and loop fasteners and straps secure the knee massager in place, and the massage heat pads can be wrapped around and locked to any knee or extended to the thighs, calves, arms, legs and held in place. 4Compact Portable Design: Wireless heated knee massager has a built in 150MA rechargeable battery. The 2 heated knee pads can be used independently to avoid the trouble of wire entanglement. The compact and portable design is very suitable for travel, home and office use. 5Ideal Gifts: It is an ideal gift for mom, dad, men, women, parents or friends, suitable for birthday, thanksgiving, Christmas gift to help them relax their knees and reduce pain.SpecificationItem Type: Electric Knee MassagerMaterial: Polyester fiberFunction: 6 massage modes, 18 strength adjustmentBattery Specifications:Built in lithium battery model: 402030Battery capacity: 150mah (shipped with built in battery)Package List1 x Knee Pad 1 x Extension Belt 1 x Host 1 x USB Cable 1 x Instruction Manual