SwingDJs

Acoustic amplifier turns headphones into speakers

The Phonofone is a gramophone-style acoustic amplifier for your MP3 player -- dock your headphones in its core and it will amplify it to 55dB.
Without the use of external power or batteries, the Phonofone inventively exploits the virtues of horn acoustics to boost the audio output of standard earphones to up to 55 decibels* (or roughly the maximum volume of laptop speakers)
Upon connecting active earphones to the Phonofone their trebly buzzing is instantly and profoundly transformed into a warm, rich and resonant sound.

Pacemaker – the pocket-size DJ system. 120 GB.
(Full deejay functionality: two independent channels, line out crossfader, headphones crossfader, separate line out jack and headphones jack, bend, pitch, cue, loop, reverse play, audio fx, filters, SNR 103, 5 ms latency, 18 hrs playback time, 5 hrs deejaying.)