Features: 1. Professional mechanical analog Chess Clock. 2. Available for Chinese Chess International Chess and for I-GO. 3. The clock adopts a mechanical structure with a timing start button. Easy Operation. 4. No Battery Needed Wind-up mechanism ensures that you'll never have to interrupt a game to replace a battery. The timing is accurate and the daily error is no more than 1 second. 5. It is suitable for all kinds of chess game timing clocks. 6. Easy to Use: Just wind it up and set the hands before the game begins. Durable plastic casing lightweight and portable. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Material: plastic case copper-zinc alloy movement Product size: 15x5.5x9cm includes: 1 x Mechanical Chess Clocks "