Specifications:Kits Model:YL-6Kits name:six bits clock kitsOperating voltage:7-12VAccuracy of travel time: error less than 1 second in 24 hoursFeatures: alarm clock, stopwatch, countdown and counterPCB Size:9.7* 4.9cm/3.82*1.93inchOperating Specification 1) Specification of function KeysS3 is for function choosing for key,S2 for function expansion and the S1 for adding the value with one.Clock Function: It displays 10:10:00 when it's on.for Time checking Function: The for time and colon start flashing after Press the S3 for a short for time. Press S2 to add one hour and Pree S1 to add 1 minute. But the second for time is unadjustable. Alarming Function: It displays 22:10:00 and the colon lights after press S3 twice in a short for time. Press S2 to add one hour and Pree S1 to add 1 minute. But the second for time is unadjustable. When the value of hour is over 23:00pm, it displays :: which is the function for turn off the alarming function.Countdown Function: It displays O and the colon is in dark after press S3 three times in a short for time. The hour for time is added after pressing S2 and 1 minute is added after pressing S1. It'll start to countdown when press S2 for the sixth for time. The for time can be adjusted again after pressing S2 for one more for time. And the countdown function is off.Stopwatch Function: It displays 00:00:00 and the colon lights after press S3 four times in a short for time. It starts clocking with the stopwatch after pressing S2. And if press S2 one more for time, the clocking will be end. And the stopwatch goes to reset status after pressing S1 at this for time. Counter Function: It displays 00:00:00 and the colon is in dark after press S3 five times in a short for time. Press S2 to add the value with one for counter and Pree S1 to let the counter in reset status. Note:Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bidDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes:1 x 6 bits clock kits