| Name/Model | RETRO NANO |
| Hardware solution | DAC: CS43131*2, USB, Bluetooth chip: QCC5125 |
| Color | Blue/White |
| Volume control | Physical button |
| Weight | About 28.3g (with battery) |
| Dimensions | About 55.1×37.5×13.7mm |
| Driver-free mode (switch mode) | Supported |
| Phone decoding (USB dongle mode) | Supported (switch work mode to Phone position) |
| Microphone function | Supports Bluetooth voice calls, built-in omnidirectional microphone + supports in-line control for CTIA mic |
| Channel balance | ＜0.2dB |
| Gain | L/H |
| FIIO Control | Supports settings through the APP |
| Deep standby mode | If no connection, auto-enter standby mode after 5 minutes |
| Status indicator | Display indicates the transmission codec, charging, battery level, volume, sampling rate, EQ, and menu |
| Bluetooth codec indicator | Blue: SBC; Cyan: AAC; Purple: aptX/aptX LL; Yellow: aptX HD; White: LDAC; Green: aptX Adaptive |
| Bluetooth reception (5.1) | AAC/SBC/aptX/aptX LL/aptX Adaptive/aptX HD/LDAC |
| Display | 0.96-inch TFT (80*160) bezel-less display |
| Firmware upgrade | OTA upgrade, via FIIO Control |
| Buttons | Multifunction button*1; Play/Pause*1; Volume up*1; Volume down*1 |
| USB | USB Type-C (Charging/data transfer) |
| Headphone output | Standard 3.5mm port |
| Balanced headphone output | Standard 4.4mm port |
| Slide switch | Power switch*1 |
| Power supply | DC 5V ≥1A |
| Charging time | ≤2 hrs |
| Type of battery | 10440 lithium battery 3.7V |
| Audio input | Bluetooth reception |
| Bluetooth codec | AAC |
| Volume | 22 level |
| Gain | High |
