<b>Soundavo HP-DAC1 Digital to Analog Converter / Headphone Preamp is a high performance USB DAC, comes with TI PCM1754 24-Bit 192KHz DAC. USB will be the best connection for play the digital music file from your PC/Laptop (currently only support IOS 12 version software or below for the iPhone/iPad device), the digital audio signal will be passed to the HP-DAC1 to let it do the digital-to-analog converting and analog processing / output, provides clarity, separation, less muffing sound (Window & Mac OS are supported with No driver installation required)