The ETL listed Apollo 12 is the solution to your short cycle timing needs! With a 5 second to 30 minute 'ON TIME' and 5 second to 60 minute 'OFF TIME' you can accomplish your most strict timing demands. This timer is great for ebb and flow tables, as well as aeroponic systems. In conjunction with our CO2 Regulator, it will accommodate CO2 injection in any room configuration. 15 Amps/120 Volts/60 Hz. 3 year warranty included.