Description: Made of durable plastic casing and copper-zinc alloy movement, safe, environmentally friendly and durable. Transparent casing, retro design, more fashion 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. Specification: Material: Plastic+Alloy. 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. Size Chart: Size: 15.5x5.5x9.5cm / 6.1x2.17x3.74inch. 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.