Description.?Mechanical structure?: Adopt mechanical structure with timing start button, which makes the timing operation intuitive, convenient and accurate.?Chess game??No battery needed, driven by clockwork, easy to use, similar to the working mode of quartz clock. It is the timing tool used in most chess games in Europe and America.?High accuracy??The daily error is not more than 1 second, it is suitable for timing clocks in various chess games.?Wood?: made of wood and plastic, strong and durable, not easy to break. Wooden color design and workmanship.?Special care?: Chess clock should avoid contact with corrosive substances and avoid exposure to sunlight, rain, water drops and strong magnetic fields nearby.Specifications.This chess clock without batteries, clockwork drive, easy to use and simple, similar to the quartz clock operation.Material: plastic shell, copper and zinc alloy movementProduct size: 15x5.5x9cmBox: 19X7.5X12CMNet weight of chess clock: 290g, + color box is 360gSuitable for chess, Chinese chess, Go and other games.Color: Original wood light color (in stock), original wood brown minimum order quantity 200pcs.Regular packing: color box, 20pcs in 1 outer box. Outer box size: 40X39X28CM, gross weight: 8.5KG3. chess clock instructions for use.1). Competition clock with timing start button mechanical structure, competition timing operation is intuitive, convenient, accurate timing, daily error is not more than 1 second, suitable for all kinds of chess competition timing clock.2). Use method.a) Timing button operation method, press the left button, the left clock stops timing, the right clock starts timing. Conversely, press the right button, the right side to stop timing, the left side to start timing, both sides of the button at the same time press the halfway (that is, the two sides of the button in the same horizontal position), both clocks are in the stop timing state.b) Second hand zero adjustmentBy alternately operating the buttons on both sides, the second hand of the two clocks can be adjusted in turn at the 12 o'clock position (zero position), respectively, in accordance with the direction of the arrow on the back of the clock dial needle hole dial the hour hand, minute hand to 12 o'clock position. Competition clock, the minute hand zero position to distinguish the minute hand to push the whole point of the judgment mark "small red flag" to the right up to 12 o'clock position, to "small red flag" free fall points for the alignment of the scale for the zero position.4. MaintenanceChess clock should be in contact with corrosive substances, avoid exposure to the sun, rain, falling and close to strong magnetic fields