Green Air Cyclestat 4 Repeat Cycle Timer 

The Cyclestat repeat cycle timers have solved the age old problem of accurate short cycle timing. Perfect for plant zone environments, reptile habitats or any other application requiring automatic short cycle switching. 

No programming required. Easy to set and operate. Microprocessor time counter with adjustable frequency and duration. Use Cyclestat timers for fogging, misting, spray stakes, drip system timing, air pumps, CO2 equipment, intake or exhaust fan control.

The interval knob may be set from 7 minutes to 8 hours. Cycle is the length of time that a specific function or condition must be maintained. Cycle may be set from 5 seconds to 30 minutes.

The Cyclestat timers utilize a duplex cordcap which provides a combination plug and receptacle power cord design. The Cyclestat-4 has a built-in photosensor to defeat timing during darkness hours. Photosensor may be switched in or out as desired.

More info from the Manufacturer (PDF format - Lots of detail.)