The Seio Electronic Controller will vary the current on two Seio water pumps. Unlike wave makers or timers, the Seio Electronic Controller keeps the pumps running at all times and will ramp the pumps up from 30% flow to 100% flow then back down. It has the ability to set the time cycles that best suit your aquatic habitat and time delay buttons for feeding. Seio Electronic Controller is a complete water movement system that no aquarium should be without. Built in auto high/low speed. Variable timing 15 seconds to 30 minutes. Runs one or two SEIO pumps. Auto restart after feeding.