Must have Machine to hook these to. Massager not included only the shoes. Healthy feet are very important for your body. Connect Massage Shoes to our massage products. Also can be used with the XP3 or any of the Hi-dow units. This gives you a sensation half way up your legs of a massage and will relieve so much tension and help greatly with lower extremity pain. Your feet will feel invigorated when massage is complete and the tired sore feet will then feel rejuvinated.