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| Model | M6 | M3K | M5 |
| CPU | Exynos 7270 14nm | Ingenic X1000/E，40nm | Ingenic X1000/E，40nm |
| CPU operating frequency | 1GHz | 1GHz | 1GHz |
| CPU No. of cores | 2 | 1 | 1 |
| DAC | ES9018Q2C | AK4376A | AK4377 |
| Bluetooth Chip | SAMSUNG S5N5C10B01-6330 | N/A | CSR8675 |
| Special features | WiFi Streaming，LDAC/HWA/aptX/aptX HD/SBC Bluetooth support，Airplay with Apple devices，FiiO Link | Long battery life, Deep sleep, Recording, Repeat | SBC/AAC/aptX/aptX-HD/LDAC Bluetooth receive, SBC/LDAC Bluetooth transmit, Recording+Bluetooth phone call, Step counter, Gesture operation, Custom screen orientation, Use with watchband |
| User interface | Customized/FiiO Music | Linux | Linux |
| WiFi | 2.4G，WiFi transmission supported | N/A | N/A |
| Bluetooth | 4.2 | N/A | 4.2 |
| Bluetooth transmit | LDAC/HWA/aptX/aptX HD/SBC (HWAAvailable when playing on M9, other codecs available when playing on M9 and using as USB DAC) | N/A | SBC/LDAC |
| Bluetooth receive | SBC/LDAC to be supported | N/A | SBC/AAC/aptX/aptX-HD/LDAC |
| DLNA | Supported | N/A | N/A |
| USB | TYPE C Two-way USB2.0 | Micro USB2.0 | TYPE C Two-way USB2.0 |
| Display size | 3.2 inches | 2.0 inches | 1.54 |
| Display type | LG IPS screen | IPS TFT | IPS TFT |
| Resolution | 480×800 | 240×320 | 240×240 |
| Touchscreen | 5-finger multi-touch | N/A | Single-touch |
| Number of colours | 16M | 262k | 262K |
| Viewable angle | Full-view | Full-view | Full-view |
| Pixel density(PPI) | 292 | 200 | 220.4 |
| RAM | 768MB | 64MB | 64MB |
| Storage expansion type | Micro SD card | Micro SD | Micro SD |
| Maximum storage expansion | Theoretically 2TB (only one micro SD card slot) | Theoretically 2TB (only one micro SD card slot) | Theoretically 2TB (only one micro SD card slot) |
| ROM | 4GB | N/A | N/A |
| ROM available to user | 2GB | N/A | N/A |
| Buttons | Physical button+Touch screen | Touch button+Physical button | Physical button+Touch screen |
| Headphone out (PO) | 3.5mm standard headphone output jack (shared PO/LO) | Standard 3.5mm stereo jack decorated with metal ring | 3.5mm standard headphone output jack |
| Line out (LO) | 3.5 mm port（shared PO） | N/A | 3.5 mm port（shared PO） |
| SPDIF output | N/A | N/A | 3.5 mm port（shared PO） |
| USB | Two-way TYPE C USB2.0（Charging/Data transmisson/USB DAC/USB Audio） | Micro USB2.0（Charging/Data transfer/OTG/USB DAC） | Two-way TYPE C USB2.0（Charging/Data transmisson/USB DAC/USB Audio） |
| Color | Black | Silver, Black | Black, Red, Blue, Silver, Titanium |
| Dimensions | 53.3mm×92.5mm×11.5mm | 90.8mm×44.2mm×12mm | 45.3*42*13.7mm |
| Weight | about 83g | about 116 g | about 38g |
| Volume control | 120 steps +/- button control | 60 steps digital potentiometer | 60 steps digital potentiometer |
| Recommended headphone impedance | 16~100 Ω | 16~100 Ω | 16~100Ω |
| Equalizer | 10-band EQ (±6dB), 9 presets+custom preset | 5-band EQ (±6dB)，7 presets | 5-band EQ (±6dB)，7 presets |
| Balance control | ±5dB | ±5dB | ±5dB |
| USB DAC | Up to 192kHz/24bit | Up to 192kHz/24bit | Up to 384K/32bit；DSD128 |
| USB Audio | Up to DSD128 | N/A | Up to 384K/32bit；DSD128 |
| Battery indication | Yes (accurate battery % readings) | Yes (Analog battery display) | Yes (Analog battery display) |
| Battery capacity | 1200mAh | 1100mAh | 550mAh |
| Charging time | ＜2.5h（DC5V/2A） | ＜2.5 h | ＜2.5h |
| Deep sleep time | ＞26 days | ＞38 days | ＞22 days |
| Battery life 1 | 3.5mm headphone output：＞13h | 3.5mm headphone output＞24h | 3.5mm headphone output＞10.5h |
| Battery life 2 | Bluetooth output：＞15h（SBC） | N/A | ＞12小时（SBC bluetooth transmit） |
| Battery life 3 | N/A | N/A | ＞13.5h（SBC bluetooth receive） |
| Firmware Upgrade | Supports both via zip file and OTA | Supports both via zip file | Supports both via zip file |
| Recording | N/A | Supported | Supported |
| A-B Repeat | N/A | Supported | N/A |
| OTG Transfer | N/A | Supported | Supported |
| Clock | Supported | Supported | Supported |
| Third-party apps support | Preinstalled：FiiO Music, Netease Music, MOOV, Tidal, KKBOX APP whitelist：Spotify、Qobuz、Roon、Deezer，QQ Music、Xiami Music、JOOX、ES file manager、Himalaya (copy the apk file to Micro SD card or internal storage to install) |
N/A | N/A |
| Headphone out specifications（3.5mm port） | |||
| Output power 1 | ≥110mW（16Ω / THD+N＜1%) | ≥42mW（16Ω / THD+N＜1%) | ≥42mW（16Ω / THD+N＜1%） |
| Output power 2 | ≥70mW（32Ω /THD+N＜1%) | ≥25mW（32Ω /THD+N＜1%) | ≥24mW（32Ω / THD+N＜1%） |
| Output power 3 | ≥7mW（300Ω / THD+N＜1%) | N/A | ≥2.7mW（300Ω / THD+N＜1%） |
| Frequency response | 10Hz~85 kHz（-3dB） | 5Hz~90 kHz（-3dB） | 5Hz~90 kHz（-3dB） |
| SNR | ≥118dB | ≥117dB | ≥118dB |
| Output impedance | ＜2Ω | ＜1Ω（32Ω） | ＜0.5Ω |
| THD+N | ＜0.002%（1kHz/32Ω） | ＜0.004%（1kHz/32Ω） | ＜0.003%（1kHz/32Ω） |
| Separation | ＞75dB | N/A | 74dB |
| Noise floor | ＜3uV | ＜2uV | ＜2.5μV |
| File format support | |||
| Lossless: | DSD：DSD64，128（iso”“.dsf”,“.dff”） APE(Fast): 192 kHz/24 bit APE(Normal): 192 kHz/24 bit APE (High): 192kHz/24 bit APE (Extra High): 48kHz/24 bit APE (Insane): 48kHz/24 bit FLAC: 192 kHz/24 bit WAV: 192 kHz/64 bit Aiff：192 kHz/24 bit Aif:192 kHz/24 bit WMA Lossless: 96 kHz/24 bit Apple Lossless: 192 kHz/24 bit |
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 |
DSD：DSD64，128（“.dsf”,“.dff”） APE(Fast): 384 kHz/24 bit APE(Normal): 96 kHz/24 bit APE (High): 96kHz/24 bit APE (Extra High): not supported APE (Insane): not supported FLAC: 384kHz/24 bit WAV: 384 kHz/32 bit Aiff：192 kHz/32bit Aif:192 kHz/24 bit WMA Lossless: 96 kHz/24 bit Apple Lossless: 192 kHz/24 bit |
| Lossy compression: | MP3，OGG，WMA，AAC… | MP3，OGG，WMA，AAC… | MP3，OGG，WMA，AAC… |
