The DT25 offers the very best value in a digital chess clock with features that chess players look for. There are 59 preset timing options to facilitate bonus, delay, and byo-yomi. All preset options are neatly displayed on the bottom of the clock for quick and easy reference so there's no need to get the manual out. You can choose to use the sound or turn it off if you don't need it. The case is made from a durable plastic and has a sleek angled design that makes it easy for the players to read. Requires 2 double A batteries which are included. 59 Preset Game Options Listed on Bottom of Clock; Large LED Screen 5.5" x 1.125"; Overall Dimensions: 7.125" x 4" x 2.25" tall; Retains Previous Game Settings after being Turned Off; Easy to use Controls on Front of Clock; Sound on/off Option; Lighted Buttons; Requires 2 AA Batteries (included); Comes Packaged in an Attractive Cardboard Box; Manufactured Under ISO9001 Standards;