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General Specifications
Model/Number M3 Headphone Port Standard 3.5mm Headphone Port
Color Ivory white, Blue, Black, Cyan Drive Ability 16~100 Ω
Dimensions 74 mm× 39.7 mm× 9.1 mm Volume Control 60 steps digital potentiometer
Weight 40 g Equalizer 5-band equalizer (±6dB)
Display Screen 2.0", TFT screen with 240x320 pixels Treble N/A
Line Out N/A Bass N/A
Digital Out (Coaxial) N/A Balance 10 dB
Partial Performance Parameters for Headphone Output
Output Power 1 >50 mW(16Ω//THD+N<1%) Output Impedance <0.4Ω(32Ω)
Output Power 2 >30 mW(32Ω/THD+N<1%) Crosstalk >70 dB (1 kHz)
SNR ≥95 dB (A-weighted) THD+N <0.008% (1 kHz)
Frequency Response 8 Hz~47 kHz(-3dB) MAX Output Voltage >2.8 Vp-p
Power and Battery

DC5V ≥500mA (Recommended)

Battery Capacity 550 mAh
Charge Display Battery gauge moves until fully charged Battery Display Yes

Battery Life

>24 h Charging Time

<2.5 h

Battery Life Test Conditions


Load M3 open earbuds (27 Ω)
Volume 22 EQ OFF
Test File MP3 44.1kHz/16bit (download link)

Audio Formats Supported


APE(Fast): 48 kHz/16 bit;
APE(Normal): 48 kHz/16 bit;
APE (High): 48 kHz/16 bit;
FLAC: 48 kHz/24 bit;
WAV: 96 kHz/24 bit;

Lossy compression: MP3 / WMA / OGG / M4A (excl. raw .AAC, HE-AAC coding and .m4a encrypted ALAC)

Chips used 

SoC: ATJ2129  ,  DAC: CS42L51



Frequency Response diagram of curves

Test condition:VOL=MAX,  Headphone output(33 ohms loaded)

Red curve: Left channel , Blue curve: Right channel






Distortion diagram of curves.

Test condition: Test condition:play -5 dB sinusoidal signal, Headphone output





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