We are manufacturer, professional audio speakers. 1, 3-10W 2, 70/100V.110*16KHz 3, ... +_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 mounted speaker