We are manufacturer, professional: speakers. 1, 3-6W 2, Voltage.70-100V 3,stainless steel form. 4,As usual hotels, hospitals ModelYF-607Rated power3-6WLine voltage70-100VSensitivity91±3dBFrequency response110-16KHzHole dimensionsø148-158mmItem dimensionsø180×60mmWe are manufacturer, professional speakers.1. plastic cover 3-6W.2. Voltage 70-100V.3. stainless steel form4. more export american...5. ...