This chess clock is suitable for most board games. It has 42 timing rules. It is easy to use, can be muted, and provides a great timekeeping tool for games. Functional Features With countdown function, multi-segment countdown, positive timing function and time delay per move. Can add seconds, time limit and read seconds. Different timing parameters can be set on the left and right sides. During the game, the timing parameters of both sides can be modified. It can display the number of moves and can be muted without affecting the player's game. Turn off and then turn on the machine, can keep the game parameters before turning off the machine. The teeter-totter button is big, good hand feeling, fast response, easy to control. Pre-set 42 rules, multi-functions, wide range of application. Product Specification Material: Plastic + Metal Battery: 2 * AA: 1.5V, 800mAh (need to bring your own) Product size: 161*100*62 mm/6.3*3.9*2.4 inches Product weight: 245 grams / 8.6 ounces Package size: 150 * 100 * 50 mm / 5.9 * 3.9 * 2.0 inches Package weight: 400 grams / 0.9 pounds