Introduction - If you have any usage issues, please Google them yourself
With the microcontroller and LED digital tube display minutes and seconds, and 24 hours of run time. Reminded that the whole (short beep, the number of points on behalf of the whole time), can be achieved using the key switch when the sub-adjusted, stopwatch/clock function conversion, energy saving (turn off the display) and set the timer to remind (buzzer) and other functions