ESP Series 4 Modular Indoor Station for residential and light commercial use. 3 Independent programs, 4 automatic starts per program. Programs include: Custom (water by day of the week), Odd (water on odd days), Even (water on even days), and Cyclical (water from every other day to once every 31 days). Electrical Input requirements: 120 VAC +/- 10%, 60Hz / 230VAC +/- 10%, 50 Hz / 240VAC +/- 10%, 50 Hz. Electrical Output: 25.5 VAC 1 A. Has surge protection and Power back-up.