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: 9.3cm long ( at the longest ), 5.6cm wide ( at the widest ), 2.7cm thick. ( at the thickest ) Weight: 41g Package only included one ringer, no another cables included