2. Please allow 1-2 cm differences due to manual measurement. 1pc x Chess Clock Color: Black Widely Use: Available for Chinese Chess, International Chess and I-GO. 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. Material: The timing is accurate, and the daily error is no more than 1 second. mechanical analog Chess Clock. Durable casing, lightweight and portable. Size: About 15x5.5x9cm It is suitable for all kinds of chess game timing clocks. Easy to Use: Just wind it up and set the hands before the game .Durable casing, lightweight and portable. No Battery Needed Wind-up mechanism that you'll never have to interrupt a game to replace a battery. The clock adopts a mechanical structure with a timing start button. Easy Operation. Available for Chinese Chess, International Chess and I-GO. Widely Use: Available For Chinese Chess, International Chess And I-GO. The Timing Is Accurate, And The Daily Error Is No More Than 1 Second. 2. Please Allow 1-2 Cm Differences Due To Manual Measurement. No Battery Needed Wind-up Mechanism That You'll Never Have To Interrupt A Game To Replace A Battery. It Is Suitable For All Kinds Of Chess Game Timing Clocks.