A. The pump come with 5 levels adjustable mode. B. Use German technology, operation noise in between 35-40Db. C. Use low-voltage DC brushless control technology and advanced 6-pole sensorless 3 phase drive, the pump speed and power can be changed by adjusting PWM duty cycle and soft start, which has longer service life and lower noise. D. Ceramic shaft and bearing, make the pump have longer operation life. E. Reliable and efficient, compact in size. F. Can be used in fresh and sea water.