Cycle timers are useful when a system needs periodic power beyond a standard 24 hour cycle. Precise intervals can be programmed down to 10 seconds and as wide as 99 hour intervals. Devices can be turned on and off with simple and easy to set controls. Cycle timers are different than …regular timers as they provide the ability to set cycles beyond 24 hours, letting you power larger hydroponic systems, lights with exoplanet light cycles, and fans in a temperature regulating environment.