Loudspeaker *High-strength shell, *waterproof, moisture-proof, *corrosion-resistant, *fine qualityand reliable property megaphone(speaker,loudspeaker,horn)Features:1) High-strength shell, waterproof, moisture-proof, corrosion-resistant, fine qualityand reliable property2) Power: 20W3) Sound distortion: <5%4) Sound pressure: 120 - 130dB5)Impedance: 4 ohm