Water flows from the top bowls to the bottom bowl. They run on solor powered panel. Easy to set up, with no plumbing required.Main Cord: 2 m Weatherproof Pump, LED lights included. Solar powered type (comes with Warm Yellow LED Lights) Output: Solar. Dimension: as pic shown Power: 0.5-5W Battery: 7.4V/1500MA Max Flow Quantity: 100-350L/H Max Water Height of Pump: 80-100cm.