This chess clock is suitable for most types of chess games. It has 42 types of time rules. It is easy to use and can be quiet, provides a nice tool for timing in games. Characteristics: With the countdown function, it can perform multi-section countdown, positive time function, and delay function of each step. It can add seconds, limit times, and read seconds. On the left and right side you can set different time parameters. During the competition, the time parameters of both parties can be modified. It can display the number of chess steps, can be silent, does not affect chess players playing chess. Turn off the machine and turn it back on to keep the game parameters before turning off. Large swing button, nice handle, quick response, easy control. It has 42 pre-set rules, multifunctionality and a wide range of applications. Technical data: Material: plastic metal Battery: 2 * AA: 1,5 V, 800 mAh (supplied without battery) Product Size: 161 * 100 * 62 mm / 6,3 * 3,9 * 2,4 inch Product Weight: 245g/8,6 oz Package Weight: 400g/0.9lb List of things to pack: 1 * chess clock;