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1·This series adopt high accurate synchromotor as power source and take power supply frequency as time datum.

该系列定时器采用高精度同步电机为动力源，以电源频率为时间基准。

2·This series timers adopt high accurate synchromotor as power source and take power supply frequency as time datum. There are many specifications in time setting from 30 min. to 24 hours.

该系列定时器采用高精度同步电机为动力源，以电源频率为时间基准，在30分钟至24小时内有多种规格的定时范围。