You can call it USB DAC + Headphone amplifier(HPA) >600mW@15ohm but actually, PowerDAC has no HPA at all. Yes, PowerDAC V2 can, as an example, drive LCD3 with 600mW but only as powerful enough DAC, no analog amplification and no feedback are implemented there. It's a quite similar to Fully Digital power Amplifiers(FDA) like Sharp SM-SX100(probably earliest FDA), TACT-Millennium, Lingdorf, Wadia etc $5-10K legendary toys. PowerDAC V2 uses the same or similar Ti digital PWM modulator chip TAS5558 but of course different output stage for headphone.
HQ External DAC for your Devices
PowerDAC V2 doesn't need drivers to convert stream PCM up to 24/192 from PC/Mac. iOS, Android or Linux, however, if you wish to get full control of the built-in DSP, you need to install iOS or Android app.
Device Control through IOs and Android
Volume slider with classical Fletcher–Munson loudness curves .
Familiar HiFi Bass/Treble sliders .
Intuitive controllable filters i.e. 7 parametric EQs, left/right gestures control frequency, up/down gain, zoom in/out Q-factor. Also available LPF/HPF and APF for phase alignment and text form Biquad control just in case(actually, it comes from another my project HiFiTOY crazy-tiny 250W@4ohm PowerDAC where LPF/HPF/APF needed for bi/tri-amping)