In addition to the general features include electronic clock especially increasing alarm clock function stopwatch function countdown function and counter functions AT89C2051 resources are fully utilized YCL6 makes the full use of the singlechip resources which is featured with the function of alarm clock countdown clock stopwatch and counter Kits Model YL6 Kits name six bits clock kits Operating voltage 712V PCB Size 92 49mm Accuracy of travel time error less than 1 second in 24 hours Features alarm clock stopwatch countdown and counter Package Included 1 x DIY Kits C51 Electronic Clock Digital Tube LED Display Suite Electronic Module Parts and Components DC 712V