Timing rules include BASIC, BONUS, DELAY, BYO-YOMI, and COUNT-UP. The device automatically switches to positive timing mode after countdown. User-defined time can be set up to 9:59:59, with different timing parameters available for both sides, and time settings can be modified during gameplay. The device automatically saves previously set parameters before shutdown. Step recording function allows viewing or editing of moves up to 999 steps. Sound and shutdown settings: voice prompts can be turned on or off, and the chess clock can be enabled or disabled. Functions: BASIC: Timing mode in current time DELAY: Delay mode in current time BONUS: Bonus time addition mode in current time BYO-YOMI: Go countdown mode in current time Battery: 2 x AA batteries (not included) Color: Black Material: ABS Package Contents: 1 x Chronograph (Only the above contents included; other items not included) Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.