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DISCONTINUED. (Verified 5/2001) RETAINED IN DATABASE FOR REFERENCE. Zygo Model 20 is a two-choice communication training aid. The Model 20 is a small electronic box with two large buttons that light up when pressed. The colors of the lights are red and amber, and each light has a jack to allow external switches to be used for device operation if desired. POWER: Battery operated. DIMENSIONS: 8 x 5.5 x 1.5 inches. WEIGHT: 1.25 pounds.