W1: Classic Wave Mode remote the up/down button to adjust the wave patterns among one or more pumps at the same time.? W2: Sine Wave Mode: one or more pumps can operate at the same time in this mode the flow rate changing between 30-100% and flow regulation looks like s sine curve.? Else: Random Wave Mode: one or more pumps can operate at the same time, it is a random mode of the pump power change in a random date all the time without regulation.? H: Constant Wave Mode; One or more pumps can operate at the same time.? C: Shift to flow mode: Two pumps are needed to be operated at the same time Then they shift from wave to flow alternately P1 work, P2 stop, P2 work, P1 stop alternately.? Feed Mode: short press the stop button, the pump stops working for 10 minutes for the fish eating. 100V 60Hz US plug, 700L(184gal) to 9000L (2377gal), Recommend for 40-80 gallonsInput: DC 24V 35-watt; Dimension: 3.25″ Dia x 4.25″L