1. Product Overview
The SANSUI F31 is a versatile portable multimedia player designed for on-the-go entertainment. It integrates a multi-band FM radio, a Bluetooth speaker, and a music player with support for USB drives, TF cards, and AUX input. Featuring a clear LCD screen, HD hands-free calling, and an upgraded treble and bass diaphragm, it delivers a rich and realistic audio experience. Its compact design and built-in rechargeable battery make it ideal for both indoor and outdoor use.
Front view of the SANSUI F31 portable radio and Bluetooth speaker.
Demonstration of the SANSUI F31 portable radio and speaker, showcasing its features and RGB lighting.
2. Package Contents
- SANSUI F31 Portable Radio and Bluetooth Speaker
- USB Charging Cable
- User Manual (this document)
- Lanyard (for portability)
3. Setup Instructions
3.1 Charging the Device
- Connect the provided USB charging cable to the DC 5V port on the speaker.
- Plug the other end of the USB cable into a compatible USB power adapter (not included) or a computer's USB port.
- The LCD screen will indicate charging status. A full charge typically provides 3-4 hours of playback.
- Disconnect the charger once fully charged to preserve battery life.
3.2 Powering On/Off
- To Power On: Press and hold the Power button (
) until the LCD screen illuminates. - To Power Off: Press and hold the Power button again until the LCD screen turns off.
4. Operating Instructions
4.1 Mode Selection
Press the 'M' (Mode) button to cycle through available modes: Bluetooth, FM Radio, USB, TF Card, and AUX.
The SANSUI F31 features multiple play modes including Bluetooth, AUX, USB, and TF card playback.
4.2 Bluetooth Mode
- Switch the speaker to Bluetooth mode. The LCD screen will display 'BLUE' and a blinking Bluetooth icon, indicating it's ready for pairing.
- On your mobile device, enable Bluetooth and search for 'SANSUI F31'.
- Select 'SANSUI F31' to pair. Once connected, the Bluetooth icon will stop blinking.
- You can now play audio from your device through the speaker.
4.3 FM Radio Mode
- Switch the speaker to FM Radio mode.
- Press and hold the Play/Pause button to initiate an automatic station scan. The speaker will scan and save available FM stations.
- Use the Previous/Next track buttons to navigate through the saved stations.
4.4 USB/TF Card Playback
- Insert a USB drive into the USB port or a TF card into the TF card slot.
- Switch the speaker to USB or TF Card mode. The speaker will automatically detect and begin playing audio files (MP3 format recommended).
- Use the Play/Pause, Previous/Next track buttons to control playback.
4.5 AUX Input
- Connect an external audio device (e.g., smartphone, MP3 player) to the AUX port using a 3.5mm audio cable (not included).
- Switch the speaker to AUX mode.
- Play audio from your connected device.
4.6 HD Hands-Free Calling
When connected via Bluetooth to a smartphone, the SANSUI F31 supports hands-free calling.
- Answer Call: Press the Play/Pause button once.
- End Call: Press the Play/Pause button once during a call.
- Reject Call: Press and hold the Play/Pause button.
The SANSUI F31 supports HD hands-free calling when paired with a smartphone.
4.7 One-Click Recording
The speaker features a recording function, useful for capturing FM radio broadcasts or voice notes.
- To Record: In USB or TF card playback mode, long press the recording button (often marked with a microphone icon) to start recording.
- To Stop Recording: Long press the recording button again.
- To Delete Recording: Use the dedicated delete button (if available, often next to the recording button).
The SANSUI F31 offers one-click recording and deletion functionality.
4.8 Volume and Track Control
- Volume Up/Down: Use the dedicated volume buttons (often marked with '+' and '-').
- Next/Previous Track: Use the 'Next' and 'Previous' track buttons.
5. Maintenance
5.1 Cleaning
- Wipe the exterior of the speaker with a soft, dry cloth.
- Do not use abrasive cleaners, alcohol, or solvents, as these may damage the surface.
- Keep the ports free of dust and debris.
5.2 Storage
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the battery to about 50% every few months to maintain battery health.
5.3 Battery Care
- Avoid fully discharging the battery frequently.
- Do not expose the device to temperatures above 60°C (140°F) or below -10°C (14°F).
- Use only the provided charging cable or a certified equivalent.
6. Troubleshooting
- Device does not power on: Ensure the battery is charged. Connect to a power source and try again.
- No sound: Check the volume level on both the speaker and the connected device. Ensure the correct mode is selected (Bluetooth, FM, USB, TF, AUX).
- Bluetooth pairing fails: Make sure the speaker is in Bluetooth pairing mode. Ensure your device's Bluetooth is on and within range (up to 10 meters). Try restarting both devices.
- Poor FM radio reception: Extend the antenna fully. Try moving the speaker to a different location, away from potential interference sources.
- USB/TF card not recognized: Ensure the card/drive is inserted correctly. Check that the audio files are in a supported format (e.g., MP3). Try a different USB drive or TF card.
- Hands-free calling issues: Ensure the speaker is properly paired via Bluetooth and your phone's audio output is set to the speaker.
7. Specifications
Visual representation of key product parameters and available colors.
| Feature | Specification |
|---|---|
| Product Name | Multimedia Player (fm radio speaker with usb mp3 player alarm) |
| Model Number | F31 |
| Brand Name | SANSUI (also listed as MDNG, Merison) |
| Speaker Type | Portable |
| Channels | 2 (2.0) |
| Output Power (PMPO) | 10 W |
| Speaker Power | 10W |
| Frequency Range | 100Hz-20KHz (Product Parameter image states 150Hz-18KHz) |
| Sensitivity | 70dB |
| Impedance | 4 Ohm |
| Bluetooth Version | 5.0 |
| Bluetooth Distance | 10M |
| Communication | AUX, USB, Bluetooth |
| Playback Function | Radio, MP3 |
| Support | BT, USB, TF, Earphone, FM Radio, Recording |
| Battery | Yes, Rechargeable Battery Pack |
| Battery Capacity | 1200mAh |
| Play Time | 3-4 hours |
| Power Source | AC, Battery |
| Input Power (W) | <25 W |
| Input Power | DC 5V/1A |
| Display Screen | Yes |
| Waterproof | Yes |
| Material | Plastic (Speaker material: ABS+iron mesh) |
| Weight | 400g (Product Weight: ~264g) |
| Dimensions (H x W x D) | 46mm x 71mm x 123mm |
| Certification | CE, RoHS |
8. User Tips
- Optimize Battery Life: For longer battery life, avoid frequently draining the battery completely. Charge it regularly, especially if you use it often.
- Improve Radio Reception: When using FM radio, fully extend the antenna and try different orientations or locations to find the best signal. Concrete walls or large metal objects can interfere with reception.
- Recording Quality: For best recording quality, ensure the microphone is unobstructed and record in a quiet environment.
- Portability: Utilize the included lanyard for easy carrying, especially during outdoor activities.
- File Compatibility: Ensure USB drives and TF cards are formatted to FAT32 and contain audio files in common formats like MP3 for optimal compatibility.
9. Warranty and Support
For warranty information and technical support, please refer to the seller's policies or contact the manufacturer directly. Keep your proof of purchase for any warranty claims.
