F33
Sansui F33 Portable Bluetooth Speaker User Manual
Model: F33
1. Introduction
This user manual provides comprehensive instructions for the operation and maintenance of your Sansui F33 Portable Bluetooth Speaker. Please read this manual carefully before using the device to ensure proper functionality and to maximize your listening experience. The Sansui F33 is a versatile portable speaker designed for outdoor and indoor use, featuring Bluetooth connectivity, FM radio, USB drive, and TF card support.
2. Product Overview
The Sansui F33 Portable Bluetooth Speaker is a compact and powerful audio device. It supports multiple playback modes and offers a clear LED display for easy navigation.

Figure 2.1: Front view of the Sansui F33 Portable Bluetooth Speaker, showcasing the speaker grille, control panel with numeric keypad, LED display, and retractable antenna. On the right side, there are ports for USB, headphone output, and Type-C charging.
Key Features:
- Bluetooth 5.0 for wireless audio streaming.
- FM Radio with automatic tuning and support for campus broadcasting.
- Support for USB flash drive and TF (MicroSD) card playback.
- Digital music selection and request function.
- MP3 earphone function for private listening.
- One-click pause and single loop playback.
- Type-C charging interface.
- High-definition LED screen for displaying playback time and status.
- Detachable 18650 battery (1200mAh) for extended use.

Figure 2.2: A red Sansui F33 speaker demonstrating the headphone output functionality, with a 3.5mm audio jack plugged into the designated port on the side.
3. Setup
3.1 Charging the Battery
- Locate the Type-C charging port on the side of the speaker.
- Connect the provided Type-C USB cable to the speaker and the other end to a compatible USB power adapter (not included) or a computer's USB port.
- The LED screen will indicate charging status. A full charge typically takes approximately 3-4 hours.
- Ensure the speaker is fully charged before first use for optimal battery life.
3.2 Powering On/Off
- To power on, press and hold the power button (usually marked with a power symbol) located on the side or top of the speaker until the LED screen illuminates.
- To power off, press and hold the power button again until the LED screen turns off.
4. Operating Instructions
4.1 Mode Selection
Press the 'M' (Mode) button on the control panel to cycle through available modes: Bluetooth, FM Radio, USB, and TF Card.
4.2 Bluetooth Mode
- Switch the speaker to Bluetooth mode. The LED screen will display "BT" or a similar indicator, and the speaker will enter pairing mode.
- On your mobile device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Sansui F33" from the list of found devices.
- Once paired, the speaker will confirm the connection, and you can now play audio from your device wirelessly.
4.3 FM Radio Mode
- Extend the retractable antenna fully for better reception.
- Switch the speaker to FM Radio mode.
- Press the Play/Pause button (►►) to initiate an automatic station scan. The speaker will scan and save available FM stations.
- Use the Previous (◀◀) and Next (►►) buttons to navigate through the saved stations.
- For manual tuning or direct frequency input, use the numeric keypad.
4.4 USB Drive / TF Card Playback
- Insert a USB flash drive or a TF (MicroSD) card containing MP3 audio files into the respective port.
- The speaker will automatically switch to USB or TF card mode and begin playing the first track. If not, press the 'M' button to select the correct mode.
- Use the Play/Pause (►►), Previous (◀◀), and Next (►►) buttons to control playback.
- Use the numeric keypad to directly select a track number.
4.5 Headphone Output
- Connect standard 3.5mm headphones to the headphone jack on the side of the speaker.
- Audio will automatically switch from the speaker to the connected headphones.
4.6 Volume Control
- Use the '+' and '-' buttons on the control panel to adjust the volume.
5. Maintenance
- Keep the speaker dry. Avoid exposure to water or excessive humidity.
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Store the speaker in a cool, dry place when not in use for extended periods.
- Avoid dropping the speaker or subjecting it to strong impacts.
- If the battery is detachable, ensure it is properly inserted and secured.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Battery is low or depleted. | Charge the speaker using the provided Type-C cable. |
| No sound from speaker. | Volume is too low; Speaker is paused; Incorrect mode selected; Device not paired (Bluetooth). | Increase volume; Press Play/Pause; Select correct mode (Bluetooth, FM, USB, TF); Re-pair Bluetooth device. |
| Poor FM radio reception. | Antenna not extended; Weak signal area. | Fully extend the antenna; Try moving the speaker to a different location. |
| USB/TF card not playing. | Card/drive not inserted correctly; Incompatible file format; Corrupted files. | Re-insert the card/drive; Ensure files are MP3 format; Try a different card/drive. |
| Bluetooth pairing failed. | Speaker not in pairing mode; Device too far; Interference. | Ensure speaker is in Bluetooth pairing mode; Move device closer; Turn off other Bluetooth devices. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | Sansui F33 |
| Product Dimensions | 114.5mm x 28mm x 69mm |
| Net Weight | 167g |
| Bluetooth Version | 5.0 |
| Speaker Type | Outdoor-Subwoofer |
| Horn Diameter | 57mm (1.5-inch internal magnetic speaker) |
| Rated Power | 3W |
| Frequency Response | 150Hz-18KHz |
| Battery Type | Detachable 18650 |
| Battery Capacity | 1200mAh |
| Battery Life | Approximately 5 hours |
| Charging Interface | Type-C |
| Supported Media | TF Card, USB Flash Drive |
| Connectivity Technology | USB, Bluetooth |
| Color | BLUE with 16GB TF (as per product variant) |
| Material | Other |
| Manufacturer | Generic |
8. Warranty and Support
8.1 Warranty Information
This product comes with a 12-month warranty. In case of any quality issues, a full refund or replacement will be offered.
8.2 Customer Support
For any issues with the product, such as damaged or incorrect items, please contact customer service through the platform where the product was purchased. We are committed to providing the best solution to resolve any issues promptly.