This document is the owner's manual for the OPTIMA PC-306/PC-406PS automatic sprinkler timer. The timer is designed for use with standard 24 VAC automatic sprinkler valves and can be used in any 110 VAC / 60 Hz ± 10% AC outlet (240 VAC, 50 HZ for international version). The timer provides simple programming and flexible schedules to meet your landscape watering needs. It is recommended to read this owner's manual completely before installing the timer to ensure proper operation and safety. Thank you for choosing the OPTIMA PC-306, PC-406PS timer. The timer features several innovative functions that allow you to tailor your program to fit a variety of watering requirements and is easy to program.