This rock speaker features wonderful sound quality and is especially suitable for outdoor locations broadcastbecause of itswaterproof,anti-sunshine and anti-aging function.WS-838 Specifications: 1) Speaker caliber:4.5'' 2) Rated power at 100V: 30W 3) Max. power:45W 4) Optional power:(30/20W) 5) Input impedance:333/500 Ohm 6) Frequency response: 80-13, 000Hz 7) Sensitivity (1W/1m):88dB 8) Sound pressure level (1m): 103dB 9) Figuration dimensions:290x210x550mm 10)CTN Dim:282x295x570mm 11)N.W(1PC):7KG 12)G.W(1PC):7.9KG