本计时器采用脉冲数字电路设计,可以预置30秒计时报警,到达预定时间后。报警系统会自动显光电报警,这可以在篮球场上给予裁判极大帮助。本计时器功能齐全,可以直接清零,启动、以及具有光电报警功能,计时器为30秒递减计时。其计时间隔为2秒同时应用了七段数码管来显示时间。可以方便地实现断点计时功能,当计时器从30递减到0时,会发出光电报警信号。 This timer uses pulse digital circuit design, you can preset 30 seconds timer alarm, after the scheduled time. Alarm system will automatically display optical alarm, which can give the referee on the basketball court a great help. The timer is fully functional, you can directly clear, start, and has a photoelectric alarm function, the timer is 30 seconds down time. The time interval of 2 seconds at the same time the application of a seven-segment LED display time. Can easily achieve breakpoint timing function, when the timer decreases from 30 to 0, it will send a photoelectric alarm signal.