1. [Classic simulation style] - This alarm clock chess timer is the perfect to any game or classroom game.If you to make more competitive, then this clock is a good way to improve.chess clock timer2.[Easy to use] - This lightweight and portable chess clock is easy to operate, just click a button Press the button on the top to start and stop the machine, but you can freeze the two clocks by keeping the buttons at an even level.Both clocks are easy to reset on the back, and each top button has a locking clip.chess clock analogue3.[High Quality] - This game timer has a clock that uses an electronic oscillator adjusted by a crystal to keep time.The frequency accuracy 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.chess clock digital4.[advantages] - The advantages of chess are huge.Children who participate in chess can improve their critical thinking, problem-solving skills, spatial awareness and social skills, which makes it an important supplement to any classroom or family.5.[Widely Used] - Suitable for Chinese Chess, International Chess.No battery winding mechanism is required to that you can replace the battery without interrupting .chess clock timer Colour:blackMaterial:ABSPackage Contents:1 x Chess Clock timer(no battery required)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.