... continuously for more than 1200 hours 2:multiple health and environmental protection filter-double ultrasonic SMS, 3 layers composite ... , hospital, office, station, stadium, dining room, concert hall and so on.ParameterNO.BNT-612Model No.VC-BNT20LVoltage120V/220V/230V ... level66dBaPower cord length12mHose length2mNet weight10..5kgsmachine length520mmmachine height490mmmachine width390mm vacuum cleaner