4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA For Chess Games: It does not require batteries, is driven by a clockwork, and is easy to use, similar to the working mode of a quartz clock. It is a timing tool used in most chess games in European and American countries.<br> Mechanical Structure: The mechanical structure with timing start button is adopted to make timing operation intuitive, convenient and accurate.<br> Special Maintenance: The chess clock should avoid contact with corrosive materials, and avoid exposure to sunlight, rain, drops and places near strong magnetic fields.<br> High Precision: The daily error is no more than 1 second, suitable for timing clocks in various chess games.<br> Wooden Material: Made of wooden material and plastic, strong and durable, not easy to break. Wooden color design, exquisite workmanship.<br> Colour: wood color<br> Material: wood + plastic<br> Size: 15x5.5x9cm<br> Package Contents:<br> 1 * Chess Timer<br> Only the above package content, other products are not included.<br> 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.