Smj JS-224A chess clock properties: The Smj JS-224A chess clock is a professional device used during international chess tournaments and other games, such as checkers and scrabble. It features precision workmanship, a large display, and an integrated circuit from the Japanese company EPSON. Technical data: 20 game tempo setting functions, compliance with all known timekeeping standards, an additional option to manually set the game pace, a sound signal, a low battery indicator, and AA batteries included (2 pcs).