We are manufacturer, professional speakers. 1, 10W. 2, 70-100V. 3, 110-16KHz. 4, As likely a screen. voice clear. soft.. ModelYH-004Rated power10WLine voltage70-100vSensitivity91±3dBFrequency response110-16KHzItem dimensions400×300×55mmNet weight2.1KgWe are manfacturer, professional speakers.1. 10W.2. 70-100V3. 110-16KHz4. As likely a screen. voice clear. soft. Art speakers