We are manufacturer, professional ceiling speakers. 1, 3-6W 2,Plastic cover. 3, 70/100V. 91+_3dB 4,As for hotels, hospitals. ModelYF-618Rated power3-6WLine voltage70-100VSensitivity91±3dBFrequency response130-16KHzHole dimensionsø155-165mmItem dimensionsø200×65mmNet weight0.71KgWe are manufacturer, professional ceiling speakers.1. 3-6aw2. Plastic cover.3. Voltage.4. 70/100V.5. As for hotels, ...