Professional Digital Chess Timer Game Clock for Board Games Portable Chess Clock Specification: Item Type: Chess Clock Material: ABS Color: Black / Yellow Optional Battery: 2 x AA battery Screen size: 103 x 23mm / 4.06 x 0.91in Item size: 140 x 88 x 45mm / 5.51 x 3.46 x 1.77in Item weight: 105g / 3.70ounce Functions: Basic: Set basic time. Reward: Set basic time and reward time. Delay: Set basic time, second reading times and time. Positive Timing: Set basic time to be 0 for overall rationing system Package List:1 x Chess Clock Large flexible button with better sense of press, easy to operate, even the elderly or users with poor eyesight can easily touch it with their fingertips, making your game run more smoothly Made of premium ABS plastic shell, high durability and, able to withstand the wear and tear of daily use for a life The chess clock supports basic, reward, delay and positive timing modes to meet the needs of different games, making the game more flexible and diversified The digital chess game clock is suitable for Chinese chess, international chess and other chess games, very practical and able to meet diversified needs of use Lightweight and small in size, so it fits in most bags conveniently and is portable to take to and from or tournament events