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Smartphones typically have a restricted output current for OTG devices. Furthermore, smartphones yield a lot of internal interference, so powering from them isn’t the most ideal.
With the CB19C, dongles can power from a clean source, such as a power bank, instead of your smartphone. Your DAC dongle gets quality power with minimal interference with the CB19C while simultaneously preserving the battery on your smartphone, achieving optimal performance from both your phone and the dongle.
I thought it didn’t work at first but it was user error. It works perfectly with my Ibasso DC04 ultra. Doesn’t siphon my hiby r4 battery anymore.