Timing rules include BASIC, BONUS, DELAY, BYO-YOMI, and COUNT-UP; automatically switches to 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 time can be adjusted during gameplay. Automatically saves previously set parameters before shutdown. Step recording function allows viewing or editing up to 999 moves. Sound and power settings: voice prompts can be turned on or off, and the chess clock can be powered on or off independently. Functions: BASIC – Standard timing mode DELAY – Delay timing mode BONUS – Increment timing mode BYO-YOMI – Countdown timing mode used in Go Battery: 2 x AA (not included) Color: Black Material: ABS Package Contents: 1 x Chronograph Note: Other items not included. Due to light reflection and display differences, the color in the image may vary slightly from the actual product. Measurement error allowed is +/- 1-3 cm.