The subject innovation is to supply to the acoustic output means and amplifying stage for converting the amplifier stage and the amplified audio signal for amplifying the audio signal from the connector and the external output terminal of the mobile phone for connection to an external sound output terminal of the cellular phone in the sound and a battery for, with a simple connection point between the mobile phone and is characterized in that it comprises a microphone and a call switch for implementing hands-free operation. According to the portable amplified speaker according to the present invention, simply amplifies all audio signals to be played on mobile phones, regardless of the type or shape of the phone can enjoy the sound of a higher quality, is made compact as an accessory to the ring of the phone since the easy mounting and easy to carry, and includes a small microphone and a call switch without having to open the cellular phone held multimedia sound and it is effective to call.