The DJ44CPro adapter allows the use of earphones or headphones with a 4.4mm Pentaconn connector to a 3.5mm Jack input for a digital audio player (DAP), digital-to-analogue converter (DAC), or amplifier (AMP). In the CNC machined aluminum housing, in addition to the 4.4mm connector manufactured in Japan by Pentaconn, ddHiFi's own 49-strand Nyx copper internal wiring places this adapter on a truly professional level.