Description: Material: Made of plastic casing and zinc alloy movement, environmentally friendly and durable. Design: Chess clocks adopt a mechanical structure with timing start button by a clockwork, convenient to use. Application: Suitable for personal family use, teaching use, Chinese chess, international chess game, and board game playing. Features: The clock is divided into two movements, left and right, each full spring can last for about 36h. Maintenance: Clocks should avoid exposure to the and rain. SIZE: 15.5x5.5x9.5cm Color: transparent Material: plastic+zinc alloy Package Contents: 1 x Chess Clock 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.