We are manufacturer, professional speakers. 1, 6-10W. 2, Plastic cover 3, 70/100V. 4,Voltage. more for hotels, supermarket. ModelYF-609Rated power6-10WLine voltage70-100VSensitivity91±3dBFrequency response110-16KHzHole dimensionsø190-200mmItem dimensionsø230×65mmWe are manufacturer, professional audio speakers.1.6-10W.2.Plastic cover.3.70/100V.4.Voltage, more for hotels. supermarket. etc... ...