Chess Clock - 7.75" Navy Blue Digital Chess ClockSuitable for Chess, Chinese Checkers, Go, and other games! Powered by a DC 3V voltage (two No. 5 batteries) 8 types (42 pieces) of timing rules. Basic time and auxiliary parameters can be set for each timing rule. Different timing parameters can be set for each side. The timing value for both sides can be adjusted during any match. The previous timing parameters from the last match will be preset for the first match after the next power on.