Made of durable wooden casing and copper-zinc alloy movement, safe, environmentally friendly and durable. This chess clock does not require batteries, is driven by a clockwork, and is easy to use, similar to the operation of a quartz clock. The game clock adopts a mechanical structure with a timing start button. the game timing operation is intuitive, convenient, accurate, and the daily error is not more than 1 second. it is suitable for timing clocks for various chess games. Suitable for personal family use, teaching use and various types of chess games, such as chess, chinese chess, go and other games. Maintenance: The chess clock should be prevented from contact with corrosive materials, and avoid exposure to the sun, rain, falling and close to strong magnetic fields. Specification: Colour:Wood color Material:Wood+plastic+metal Size:15x5.5x9cm Package Contents: 1 * Wooden Chess Timer 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.