This external power is for Trends UD-10 USB Audio Converter and it provides a better sound from the computer audio.
It effectively isolated the serious interference from within the PC/Mac case. e.g. the high frequency data signals, the switching-mode power supply and the FAN motors, etc? Whether you have an existing external DAC or an AV receiver with an open digital input, the Trends Audio UD-10 with Battery Pack can bridge the gap between your computer and the rest of your system.
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