Description: 100% Brand New and High Quality. 1. Small size, not occupy space, lightweight storage. 2. Thick soft foam, soft and comfortable without hurting the feet. 3. A key switch, start three seconds. Waterproof and moisture proof, safer to use. 4. Third gear height, free to adjust. Through the spring snaps freely adjust their comfort level. 5. Strong suction, diameter 13.5cm(5.31) after increased , refused to loosen.