Equipped with a two tone sound chamber, the Original Herdmaster offers unmatched versatility. The unique inner/outer barrel design enables you to remove outer barrel, revealing an inner rubber tube. Louder more aggressive mews and chirps are accomplished with the outer barrel combination. Mellow your calling out by removing the barrel, exposing a squeezable soft tube. Simply squeeze the tube to produce the softer close the deal mews and chirps. The Original Herdmaster is the most complete, user friendly cow calling system.Specifications and Features: Two tone sound chamber Volume & tone enhancing Easy off barrel