NO BATTERY NEEDED: Wind-up mechanism ensures uninterrupted gameplay without the need for battery replacement Professional mechanical analog chess clock INCREDIBLY ACCURATE: Precise timing with a daily error of no more than 1 second SO SIMPLE TO USE: Simply wind up and set the hands before starting the game. The tilted base allows for easy viewing of the clock dials during play Suitable for International Chess, Chinese Chess, and Go Color: As shown Material: Plastic Size: 15 x 5.5 x 9 cm Package Contents: 1 x Chess Timer Note: Other items not included. Lighting and display differences may cause slight color variation between image and actual item. Measurement may vary by +/- 1-3 cm.