E-Fox Cordless Vibrator by Raimondi is essential to eliminate the air that can be trapped under the large format tiles during installation. If these air pockets are not removed, once the adhesive cures, the air will create a vacuum that makes the slabs/tile sheets subject to breakage. Long battery life allows up to 1600 to 2100 sq. ft. to be vibrated securely on a single charge. 8" x 16" vibrating area with a large plate and 6" x 6" vibrating area with a small plate. The high-frequency vibrations along with the PVC plates maximize efficiency by minimizing machinal stress to large format tiles and slabs. 3 handles with a pointed end make the vibrating corner and cutouts easy.