采用四位双色数码管制作的万年历系统，显示颜色为红，黄，绿三种，可以显示时间，日期，温度，可以调整时间，日期，断电后不丢失数据-Using four-color digital tube production calendar system, display color is red, yellow and green, can display time, date, temperature, you can adjust the time, date, no data loss after po