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 the game.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 the voice prompt, or turn on/off the chess clock.Functions:BASIC: Means timing mode in current timeDELAY: Means current delay mode in current timeBONUS: Means second increasing mode in current timeBYO-YOMI: Means Go countdown mode in current timeBattery: 2xAA battery (not included)Note:Installation guide not included, we strongly recommend you seek 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 UseColor:Dark BlueMaterial:plasticPackage Contents:1 * Chess TimerOnly 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.