This solar powered, recirculating pump is self-contained in a 9" diameter x 2" tall unit. No cords, but the bird bath must be in direct sunlight. Use as a bubbler, or add one of the included adapters to create a stream or spray. Does not store energy, so it runs when the sun is shining and stops when it is not. 1.5" minimum water depth required to submerge pump. No priming required. Smart Solar.