Timing rules includes BASIC, BOUNS, DELAY, BYO-YOMI and COUNT-UP, it automatically switches to the positive timing mode after countdown. User-defined time can be set up to 9:59:59, different timing parameters can be set for both sides, and the time can be modified during . It can automatically save the parameters set before shutdown. Step recording function: you can view or modify the number of step taken uo to 999 step. Sound and shutdown function: you can turn/off prompt, or turn on/off the chess clock. Functions: BASIC: Means timing mode in current time DELAY: Means current delay mode in current time BONUS: Means second increasing mode in current time BYO-YOMI: Means Go countdown mode in current time Battery: 2xAA battery (not included) Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color:Dark Blue Material:plastic Package Contents: 1 * Chess Timer 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.