DONGKER Hang On Back Aquarium Filter, USB 3-in-1 Water Circulation Oxygenation Filtration Filters with Waterfall Filtrations System 250L/H Adjustable Flow for Freshwater Saltwater Tank Up to 3 Gallon

Material:Made of sturdy ABS material, transparent appearance is sturdy and easy to observe internal filtration status. Max flow rate 250L/H, perfectly fit tanks up to 3 Gallon, specially designed for small betta fish tanks and other mini aquatic tanks. Adjustable Flow & USB Power:Equipped with rotary flow control valve to adjust inlet water flow flexibly. Powered by DC 5V USB interface, fit phone chargers and USB-enabled devices, 2.5W low power consumption helps save energy, with 0.8m USB cable for convenient wiring. Ultra-quiet :Built-in turbine water pump with shock-absorbing pad on filter box lowers running noise greatly, creating quiet living environment for fish. Inlet pipe with filter basket avoid small fish and shrimps from being sucked in, and the extendable pipe can be combined freely to meet different usage needs. Space-saving Wall-mounted Design:wall-mounted installation style, which clings tightly to the fish tank wall within 0.5cm thickness, saves valuable internal space of small tanks. 3-in-1 Filtration & Oxygenation:This mini aquarium filter integrates water circulation, filtration and oxygenation . The waterfall outflow design boosts water oxygen content effectively, while the built-in biochemical cotton adsorbs impurities and debris in water, improves water clarity and reduces frequent water change frequency, suitable for both freshwater and saltwater small fish tanks.