Energy efficient, high flow low voltage water pump. Bi-directional outputs to simulate natural wave and current actions of the ocean. Variable time and output settings. Flow rates up to 5500GPH/22000LPH (on selected models). Single or dual outputs. Preset feeding settings at 8 minutes and 16 minutes. Magnet mount included to secure pump. Pre-programmed in all settings to gradually increase flow. In “auto” mode, pump initially alternates 15 seconds left and right. The alternating water currents can be set to switch every 15 seconds to 30 minutes. Mini sun moon light adapter included. 16 Volt UL listed transformer included. For aquarium sized 200-600L 65mm output O.D