Made of wooden casing and copper zinc alloy movement, safe, environmentally friendly and . 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. clock adopts a mechanical structure with a timing start button. timing operation is intuitive, convenient, accurate, and the daily error is not more than 1 second. it is suitable for timing clocks for chess games. Suitable for personal family use, teaching use and types of chess games, such as chess, chinese chess, go and . Maintenance: The chess clock should be prevented from contact with 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: 3 * Wooden Chess Timer Only 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.