Suitable for International Chess Game and Board Game Playing. Press the left button, left timer stop timing and right timer begin timing, vice versa. Press two buttons simultaneous to half, both timers are in stop state, insert the clip to make sure the stop state. Wind-up the hands before starting & push top buttons to track time during game. Made of durable wood, safe, environmentally friendly and durable. Colour: wood color Material: wood Size: 18 x 6.5 x 10cm Package Contents: 1 x chess clock Note: No need battery, the product is wind-up chess clock. Only the above package content, other products are not included. Note: Light shooting 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.