Features: Brand new and high quality This fish tank air pumps is small, light weight and portable.Suitable for outdoor fishing, small to medium size aquariums, fish tanks and so on. Our air pumps is Using special internal muffler design, which makes it super quiet, light weight and long service life. With a good air stone, puts off a nice spread of bubbles at a pretty good pace, which will makes your fish or shrimp love it. Easy to install, connect filter air stone and tube with pumps outlet, then Hanging the air pumps on the tank wall, immerse air stone into fish tank USB interface is more convenient,small and portable and everyone can operate. Specifications: Material:Plastic Type:With Switches/Without Switches Specifications:Single Head/ Double Head Tube Length:Approx.1m/39.37inches Package Includes: 1 Set USB Air Pumps note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.