Portable DAC dongle 

Enjoy Lossless Listening
on Your Phone

MagSafe convenience with HiFi

sound on the go.

MagSafe Convenience

Snap on and say goodbye to dangling dongles.

MD3 magnetically attaching to a smartphone

Strong N52 Magnetic Hold

MD3 rounded aluminum corner detail

iPhone-Inspired Rounded Corners

MD3 premium leather finish

GentlePremium Leather

Hear How Sound Should Sound

Powered by the flagship ES9039Q2M DAC, MD3 supports up to 32bit/384kHz 

lossless audio and reveals every subtle detail in music. 

The ES9603Q balanced amp lets you immerse yourself in musical sound.

16bit / 44.1kHz

32bit / 384kHz

Customize Your Screen

MD3 comes with built-in fun emojis, and you can also upload your favorite

 images—from family photos to your idols.

Photo Album

Rolling Dice
Wine Bottle
Rock Paper Scissors

Fun Image Games

Use the Vista Button to play built-in games and make the screen more interactive.

Product details

MagSafe Convenience:Snap on and go. MD3 attaches securely to your phone, eliminating dangling dongles while delivering effortless HiFi listening wherever life takes you.
Hear More Detail:Powered by the flagship ES9039Q2M DAC, MD3 uncovers subtle details, richer textures, and a more immersive listening experience from every track.
Music Without Limits:The dual USB-C design lets you charge your phone while listening, keeping your music playing through commutes, travel, work, and gaming sessions.
Make It Yours:Upload custom images, emojis, and animations to create a personalized display that makes MD3 as unique as your music collection.
Pocket-Sized Power:With up to 180mW ×2 balanced output, MD3 delivers clean, dynamic sound for modern IEMs, revealing more detail wherever you listen.

Specifications

Chipset
DAC: ESS Sabre ES9039Q2M
Amplifier Chips: ESS ES9603Q ×4
Input
USB-C (Top): Audio Decoding / Image Transfer / Charging
USB-C (Bottom): Audio Decoding / Image Transfer / Firmware Upgrade
Output
3.5mm Single-Ended, 4.4mm Balanced
USB Audio Class
UAC 2.0, UAC 1.0
Max Sampling Rate
UAC 2.0: PCM 32bit/384kHz, DSD256 (Native)
UAC 1.0: PCM 16bit/48kHz
Max Output Power (1kHz, THD+N <1%)
3.5mm: ≥80mW ×2 @32Ω
4.4mm: ≥180mW ×2 @32Ω
Frequency Response
20Hz–48kHz (±0.2dB)
SNR
3.5mm: ≥115dB
4.4mm: ≥116dB
Dynamic Range
3.5mm: ≥115dB
4.4mm: ≥116dB
THD+N
3.5mm: ≤0.00075%
4.4mm: ≤0.00084%
Noise Floor
3.5mm: <1.7μV
4.4mm: <2.7μV
Headphone Impedance
16–300Ω
Weight (without cable)
50g (±2g)
Dimensions
70 × 45 × 12 mm (2.76 × 1.77 × 0.47 in)

What‘s in the box?
  • Fosi Audio MD3
  • User Manual
  • USB-C to USB-C Adapter
  • Quick Guide