This Diamond Quartz Chess Clock is one of our best values in a good quality analog chess clock. Perfect for schools and chess clubs because it's easy to use, keeps accurate time, and will stand up to the rigors of tournament play. This clock is powered by a single AA battery which eliminates the need for winding that is necessary for mechanical clocks. Plus, this clock runs much quieter than mechanical windup clocks. This is our best value chess clock. Battery powered so no ticking like mechanical windup clocks; Requires single AA battery (included); Tilted face for easy viewing; Plastic Case; Dimensions: 7 x 4.375 x 2.625;