Aquarium Air Pump Pond Fountain Quiet Portable Powerful 10W Oxygen Aeration Pump with Four Holes Description: [Compact and Lightweight]: With its small size, it can be easily carried around and is suitable for tanks and aquariums for home and office use. [Constant Output Power]: Adjustable air volume, powerful pump, which is used for a long time to continuously support the addition of oxygen. [Silent Aeration]: The silencing pump emits noise less than 30dB and is suitable for quiet feeding environment such as living room, bedroom and so on. [Easy to Use]: Aquarium air pump pumps a lot of medium bubbles to aerate tanks, provides air for transportation or insulation during breeding. [Wide Applications]: Suitable for outdoor fishing, small and medium aquariums, tanks, ponds, etc. Specification: Material: ABS; Double hole 3,5 W: Size: 12,2 cm x 6,5 cm x 5 cm / 4,80 inch x 2,56 inch x 1,97 inch, suitable for 60 to 100 liter tank; 4W single hole: Size: 12,3cm x 6,8cm x 5,1cm / 4,84inch x 2,68inch x 2,01inch, suitable for 50 – 300L tank; 6 W double hole: Size: 12,5 cm x 7,1 cm x 5,6 cm / 4,92 inch x 2,80 inch x 2,20 inch, suitable for 60 to 500 l tank; 8 W double hole: Size: 14,1 cm x 8 cm x 6,4 cm / 5,55 inch x 3,15 inch x 2,52 inch, suitable for 70 to 700 l tank; 10 W with four holes: Size: 16,5 cm x 15,5 cm x 6,3 cm / 6,50 inch x 6,10 inch x 2,48 inch, suitable for 1000 liters; Double hole 4,5 W: size: 16,5 cm x 7,5 cm x 10,5 cm/6,50 inch x 2,95 inch x 4,13 inch; Double hole 6,5 W: size: 18,5 cm x 11 cm x 7,5 cm/7,28 inch x 4,33 inch x 2,95 inch; 5W double hole: Size: 15,5cm x 9,5cm x 6,5cm / 6,10inch x 3,74inch x 2,56inch, suitable for 60 to 100 liter tank; The package includes: 1 aquarium air pump (pump only)