"[High Quality] - This game timer has a clock that uses a crystal-adjusted electronic oscillator to keep time. The frequency precision produced by the crystal oscillator makes the clock at least an order of magnitude more accurate than the mechanical clock. The sturdy black plastic shell is reliable in structure and can stand the test of time. digital chess clock[benefits] - The benefits of chess are enormous. Children who participate in chess can improve their critical thinking, problem-solving skills, spatial awareness, and social skills, making it an important addition to any classroom or family. fide chess clock[Easy to Use] - This lightweight and portable chess clock is easy to use, just click a button Press the top button to start and stop the machine, but you can freeze both clocks by holding the buttons at equal levels. Both clocks are easy to reset on the back and each top button has a locking clip. analog chess clock[Classic Simulation Style] - This alarm clock chess timer is the perfect addition to any game or classroom game. It bears the Royal Chess logo and looks more formal. If you want to make the game more competitive, this clock is a good way to improve yourself. chess clock timer[Widely Used] - Suitable for Chinese chess, international chess. No battery winding mechanism is required to ensure that you can replace the battery without interrupting the game. traditional timer chess clock"