The OxyClone 20 site cloner works on the principle of re-circulating super oxygenated water created by the Unique OxyHead System. The OxyHead draws in oxygen from the atmosphere and produces turbulence to continuously nourish your cuttings in super oxygenated water in black light proof materials. No Leaks, No spray jets to clog up and the water stays cool. Hardwood cuttings compliant. Ready to go right out of the box. Kit includes: 1 sets of OxyCerts (20 blue) 1 OxyHead 1 molded cover 1 impact resistant reservoir 90 day warranty