FEATURE: Imported brown ceramic shaft, with high precision, wear resistance, corrosion resistance, compared with ordinary ceramic shaft, which greatly improve the service life and mute effect. The pump includes 3 modes: 20 levels adjustable mode, wave mode and feed mode. Sine wave technology, bedroom level silence. Low voltage DC supply, safety protected against leakage. Using screwless design, saving resources and more environmentally friendly. Can be used in fresh and sea water.