Battery-free: The winding mechanism ensures you don't need to interrupt your game to change batteries. Professional mechanical analog chess timer. Incredibly accurate: Precise timing, with an error of no more than 1 second per day. Easy to use: Simply wind the clock and set the hands. The tilting base design makes it easy to check the time during a game. Recommended uses: Suitable for chess, Go, and board games. Color: As shown in the picture. Material: Plastic. Dimensions: 15 x 5.5 x 9 cm. Package contents: 1 x Chess Timer. Only the above package contents are included; other products are not included. Note: Light and different monitors may cause the color of the item in the picture to be slightly different from the actual product. Dimensions may have an error of +/- 1-3 cm.