1: High speed, specialized high-speed ball bearing(NMB) offering long service life and lower noise 2: High pressure and airflow output by compact size design 3: High efficiency, much more efficient than brush motor blower 4: High reliability, specialized controller make the working more reliable 5: High intelligent, PWM speed regulation, positive inversion, PG signal feedback. Welcome to visit our official website : http://www.bldcelectricmotor.com