Plugging in the SD2 will instantly upgrade the sound quality of your phone’s audio output. The SD2 uses an ESS ES9270 DAC chip which can decode digital audio files up to 32-bit/384kHz (PCM ...

You can run it from an external power supply to run high-powered headphones without worrying about draining the battery. There are three modes: PC powered, Bluetooth DAC/amp, and phone dongle.