Multi Function: This advanced chess clock equipped with single or multi period countdown, bonus, restricted moves or time, delay and byo yomi time function. Great for chess, I-GO, Chinese chess, and other various games that require 2 players. Modify at Any Time: Our LEAP chess timer is very flexible to use, time or move can be checked or modified during the game. The counting rules on both sides can also be set to different parameters as required. Memory Function: Turn off the chess clock and on again, keep the timing rule last used before shutdown. Data save mode can save the data after [01-38] rules changed. Easy Set and Operate: There are 38 preset parameter timing rules of the chess clock, it's very convenient and can directly use without complicated setting, or can use the custom mode to set the parameter of multi period countdown, restrict moves and bonus. Portable and Durable: This digital chess timer is high quality, made of durable ABS material. The 6.49x3.74x2.44 inch compact size can put in your bag and bring to anywhere. Don't start your game without chess clock! Color: black Material: ABS 1 x AAA battery not included Package Contents: 4 x Chess Clock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.