• Fosi Audio D2 USB-C DAC Dongle
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Fosi Audio

Fosi Audio D2 USB-C DAC Dongle

Fosi Audio D2 USB-C DAC Dongle
  • Genuine & Brand-New
  • Free Shipping · Ships from China
  • 1-Year Warranty
  • 45-Day Returns
$18.99 USD
$18.99 USD
Shipping calculated at checkout.

The Fosi Audio D2 is a USB-C DAC dongle in an aluminum housing that turns a USB-C port into a 3.5mm headphone output using the CX31993 chip, with headset microphone support passed through. It's an everyday-carry fix for phones without a headphone jack and a first step up from a bundled adapter.

Who the Fosi Audio D2 is for

  • Phones without a headphone jack: It restores a 3.5mm output from the USB-C port and is small enough to leave attached to a laptop bag.
  • Gamers and people on calls: Headset microphone support passes through, so gaming headsets and mic-equipped IEM cables still work for calls.
  • First-time upgraders: It's a first upgrade over a bundled adapter, built on the CX31993 DAC/amp chip.
  • Anyone who wants a spare: Compact enough to be the backup dongle that lives in your other bag.
  • Skip it if: your phone or tablet has a Lightning port rather than USB-C; the D2 connects over USB-C only.

Fosi Audio D2 key specs

  • DAC/amp chip: CX31993
  • Input: USB-C
  • Output: 3.5mm
  • Microphone: headset mic support (passed through)
  • Housing: aluminum

Genuine Fosi Audio stock. Free shipping on every order and 45-day returns.

Fosi Audio D2 vs similar options

  • vs EPZ TP15 Lightning: Takes a Lightning input for Lightning-equipped iPhones and iPads; the D2 needs a USB-C port, so the right pick simply follows your device's connector.

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Good to know

Buying from TonePier

Is this unit genuine?

Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.

Where does my order ship from, and how long does it take?

Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.

What if it isn't for me?

You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.