... to use conveniently.7.Minimum time interval of 1 minute,10 groups on /off can be set per day ... set on / off time on each time of hours.4.” Minute”button: set on / off time on each time period ... the "clock"button, pls press"week", "hour" and "minute" button respectively to adjust to the current time. (add one ... screen display is "1 on."3.2.press"hour", "minute" and "week"button to adjust the "1 on" time ...