We are manufacturer, professional audio products. 1, 6-12W 2, Plastic cover. voice soft. clear. 3, 70/100V.4-16ohm 4,nice. ModelYF-2407Rated power6-12WLine voltage70-100VSensitivity91+_3dBFrequency response110-17KHzHole dimensions280*195mmItem dimensions305*220*100mmWe are manufacturer, professional audio products.1.6-12W2.Plastic cover, voice clear.soft.3.70/100V. 4-16ohm4.Nice.etc... audio ...