M3K

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Frequency Response diagram of curves .

3.5mm headphone output - Test condition:  32 ohms loaded, play -5 dB sinusoidal signal, Full volume

Red curve: Left channel , Blue curve: Right channel.

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Main Unit
Name / Model No. M3K Operating System Linux
CPU model Ingenic X1000/E，40nm No. of cores Single
CPU operating frequency 1GHz DAC AK4376A
Keyboard Touch button Input method Touch button+Physical button
Special features Long battery life, Deep sleep, Recording, Repeat User interface Deeply customized
Chips used SoC: Ingenic X1000/E，DAC：AK4376A
Connectivity
WiFi N/A Bluetooth N/A
USB Micro USB2.0 LDAC N/A
Display screen
Display size 2.0 inches Number of colours 262K
Display type IPS TFT Viewable angle Full-view
Resolution 240×320 Pixel density(PPI) 200
Touchscreen  N/A    
Storage
RAM 64MB ROM N/A
Storage expansion type Micro SD ROM available to user N/A
Maximum storage expansion Theoretically 2TB (only one micro SD card slot)    
Buttons and ports
Buttons Touch button+Physical button Multifuctional button Playback control/Repeat
Headphone out (PO) Standard 3.5mm stereo jack decorated with metal ring USB

Micro USB2.0

（Charging/Data transfer/OTG/USB DAC）
Line out (LO) N/A    
General
Color Silver, Black Dimensions 90.8mm×44.2mm×12mm
Weight About 77.5g Volume control 60 steps digital potentiometer
Recommended headphone impedance 16~100Ω Equalizer 5-band EQ (±6dB)，7 presets
Treble control N/A Bass boost N/A
Balance control ±5dB Gain control N/A
USB DAC Asynchronous USB Dac, up to 192kHz/24bit supported Highest sample rate supported 384kHz/32bit
Power specifications
USB power adapter DC 5V/2A Recommended Battery capacity 1100mAh Li-polymer battery
Charging indication

Large charging icon shows on display when it's off, 

small charging icon shows on upper right of

 display when it's on

 Charging time  ＜2.5 h（DC5V/2A）
Battery indication Yes    
Battery Life & Test Conditions
3.5mm headphone output：＞24h
Volume 24 Load  M3 open earbuds (27 Ω)
Screen OFF Test File MP3 44.1kHz/16bit
EQ OFF    
Others
Recording Supported A-B Repeat Supported
Date&Clock Supported USB OTG Supported
Headphone out specifications
Output power 1 ≥42mW（16Ω / THD+N＜1%) Output impedance ＜1Ω（32Ω）
Output power 2 ≥25mW（32Ω /THD+N＜1%) THD+N ＜0.004%（1kHz/32Ω）
Frequency response 5Hz~90 kHz（-3dB） Noise floor ＜2uV
SNR ≥117dB (A-weighted) Peak output voltage 2.46Vp-p
File format support
Lossless: DSD：DSD64（“.iso”“.dsf”,“.dff”）
APE(Fast): 192 kHz/24 bit
APE(Normal): 96 kHz/24 bit
APE (High): 96 kHz/24 bit
FLAC: 192 kHz/24 bit
WAV: 384 kHz/32 bit
Aiff：192 kHz/24 bit
Aif:192 kHz/24 bit
WMA Lossless: 48 kHz/24 bit
Apple Lossless: 192 kHz/24 bit
Lossy compression: MP3，AAC, OGG，WMA…