Protein Skimmer Features Brand new in box ready to be operated upon arrival Double venturi pump produces almost 50,000 micro bubbles a minute - making sure everything that can be skimmed will not be missed 2 applications: can either suck on the in wall of aquarium or hang on the tank (hanger width: 5/8") Completely self-contained: no additional equipment neededRather quiet operation will have no noise to the fishes, corals or other aquaticsUpper chamber detachable for frequent cleaning and maintenanceTotally submersible pumpOil-free motor to avoid pollution to the living circumstanceSuction cups with oscula on both pump and skimmer2 curved foam outlets help release foam fasterPower: many model for choosingVoltage: 110V-120V/60Hz 220V-240V/50HzMuch more effective than air driven protein skimmers