Comptometer consists of a brown case with 72 typewriter-like buttons. The rows of buttons are labeled from top to bottom "09", "18", "27", "36", "45", "54", "63", "72", "81". The first three columns are brown, the next three are green, and the last two are brown.There is a single red button on the upper right above the labeled buttons and a metal lever on the right side. Below the buttons, there is a row of eight indicator windows labeled 1 through 8 for each column.There is a two prong power port on the back. Four buttons have broken off and are contained in a separate bag.