No water protection, anti-dry burning design. Biochemical filtration, cultivation of nitrifying bacteria. Noise reduction and silent, bedroom-level mute, sound <35 decibels. Quickly remove the oil film and restore the clear water quality (the oil film can be removed). Universal duckbill water outlet, multi-angle oxygenation to create waves. Ingenious design, oil film regulating valve. Power : 5W Flow : 300L/H Size : 120�82�185mm Wire Length : 1.5m Suitable for fish tank size : 30cm following