Description: Made of durable wooden casing and copper-zinc alloy movement, , 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 start button. the game timing operation is intuitive, convenient, accurate, and the daily error is not more than 1 second. it is suitable 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. Specification: Size:Approx.15.5x5.5x9.5cm/6.10x2.17x3.74in Package Includes: 1 Piece Retro Analog Chess Clock Timer : Color might be slightly different due to the color calibration of each individual monitor.Please allow slightly measuring deviation due to manual measurement.