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Loud Sound Rj11 Telephone Ring Ringer AmplifierLoud Sound RJ11 Telephone Ring Ringer AmplifierFeatures of Loud Sound Rj11 Telephone Ring Ringer Amplifier The Telephone Sound Amplifier can give out clear and loud sound and it can be used in the noisy places Volume: 75dB Size: 93cm long ( at the longest ), 56cm wide ( at the widest ), 27cm thick ( ..