We are manufacturer, professional audio speakers. 1, 3-10W 2, 70/100V.110*16KHz 3, Sound clear. 4, As for schools, hospitals ModelVCS-708Rated power3-10WLine voltage70-100VSensitivity91+_3dBFrequency response110-16KHzItem dimensions290*210*130mm We are manufacturer, professional audio speaker products.1, 3-10W2, 70/100V.110-16KHz.3, Sound clear.4, As for schools, hospitals, etc.. Audio Wall ...