Features: 1) High-strength shell, waterproof, moisture-proof, corrosion-resistant, fine quality 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: 4ohm6) Frequency range: 350---5000Hz