brand new and high quality Features: Professional mechanical analog Chess Clock. Available for Chinese Chess, International Chess and I-GO. The clock adopts a mechanical structure with a timing start button. Easy Operation. The timing is accurate, and the daily error is no more than 1 second. It is suitable for all kinds of chess game timing clocks. 1. The match clock adopts the mechanical structure with timing start button. The timing operation is intuitive, convenient, accurate, and the daily error is less than 1 second. It is suitable for timing clocks of various chess games. 2. Usage: 1) Press the left button, the left clock stops timing, and the right clock starts timing. On the contrary, press the right button to stop timing on the right side, and start timing on the left side. Press the buttons on both sides for half a way at the same for time (that is, the buttons on both sides are in the same horizontal position), and the two clocks are in the stop timing state. 2) Second hand zero adjustment By alternately operating the buttons on both sides, the two clock seconds can be adjusted to the 12 o'clock position (zero position) in turn, and the hour hand is turned to the 12 o'clock position according to the for arrow direction of the pinhole on the back of the clock. In the match clock, the minute hand zero position discrimination uses the minute hand to push the whole point determination mark "small red flag" to the right to reach the 12 o'clock position, and the scale of the minute hand alignment at the moment of the "small red flag" falling freely is the zero position. 4. Maintenance Chess clock should be prevented from contact with corrosive materials, avoid exposure to the for sun, rain, drop and close to strong magnetic field Specifications: Material: plastic Color: As shown in the picture Size:11.5x5.5x9cm Quantity:1 pc Note: No retail package. Transition: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x chess timer (other accessories demo in the picture is not included.)