
SPECIFICATIONS
Bluetooth: No
Brand Name: Fosi Audio
Certification: CE
D/A Converter: ES9039Q2M
DSD Sampling Frequencies: 22.5792 MHz (DSD512)
Electrified: No
Feature 1: DAC Amp
Feature 2: Magnetic Backplate For Phone
Feature 3: HiFi Headphone Amplifier
High-concerned chemical: none
Inputs: USB Type-C
Material: Metal
Model Number: MD3
Origin: Mainland China
Outputs: 3.5 mm
PCM Sampling Frequencies: 384 kHz
PCM Word Length: 32-bit
Type: Portable
USB Compatibility: Windows 10,iOS,Android,osx
WIFI: No
Features:
Magnetic & Ultra-Portable Design
It features a strong N52 magnetic backplate that securely attaches to your phone, eliminating dangling cables. The lightweight, compact aluminum alloy chassis makes it highly portable, like a tiny "backpack" for your phone.
HiFi-Grade Audio Performance
Powered by the flagship ESS ES9039Q2M DAC chip and four ES9603Q op-amps, it supports PCM 32bit/384kHz and native DSD256, delivering detailed, low-noise sound with a warm, musical tuning ideal for long listening sessions.
Interactive 1.28" Round LCD Display
The circular screen is not just for showing volume or audio specs; it lets you display custom DIY wallpapers, built-in animations, and emojis, adding a personal touch to your device.
Playful Built-In Features
Beyond audio, it includes fun interactive elements like a photo album for your favorite images and casual games (dice rolling, spin the bottle, rock-paper-scissors), making it more than just a technical gadget.
User-Friendly & Functional Controls
With 100-step volume control and a dedicated "Vista Button," you can easily adjust settings and navigate the display features, balancing high-end audio performance with everyday usability.
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
70×45×12mm (2.76×1.77×0.47in)


























