A great alternative to electronic or mechanical timers. The PS-1 has no moving parts to wear or break. It eliminates timers and clocks to synchronize and no settings or adjustments are necessary. This controller senses the presence of light and switches outlet functions accordingly. PS-1 has a switch for "Day Power" or "Night Power". It will turn day time systems "On" when it senses the sunrise or artificial lighting and operate night time equipment when it doesn't. Uses a duplex piggyback powercord. Operates on 115 VAC with 15 amp switching capacity.