Rio Polario 22ML pump. Turbine Dual Action Programmable Aqua Pump. Energy efficient, high flow low voltage pump. Bi-directional outputs to simulate natural wave and current actions of the ocean. Variable time and output settings. Flow rates up to 3,500 GPH. Single or Dual outputs. Preset feeding settings a 8 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 to the 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.