The ART-DNe recylcing timer by Custom Automated Products controls any
application requiring a device to be turned on and off at precise
intervals. The ART-DNe has a user adjustable on time of 1 second to 40
minutes and an off time of 1 minute to 8 hours. A day/night/both switch
allows you to select the time period that the ART-DNe will operate. The
ART-DNe timers have a wide range of uses including controlling
hydroponic pumps, simple CO2 controller, turning on and off ozone
generators, running exhaust fans, etc. ART-DNe timers are rated for 15
amps @ 120 volts. Three year warranty.