1. Introduction
The SANSUI F21 is a versatile portable device combining an FM radio, Bluetooth speaker, and MP3 music player with recording capabilities. Its compact design and multiple playback options make it ideal for various uses, from personal listening to outdoor activities.
For a more detailed guide, you can refer to the official user manual in PDF format: SANSUI F21 User Manual (PDF)
2. Package Contents
- SANSUI F21 Portable Bluetooth Speaker × 1
- Charging Cable × 1
- Lanyard × 1
- User Manual × 1
3. Product Overview
The SANSUI F21 features a compact and delicate design, making it easy to carry. It supports various playback modes and includes a built-in rechargeable battery.
Key Features:
- Super Sensitive FM Radio: Strong signal reception for many radio stations (70-108MHz).
- Bluetooth 5.0: Fast transmission, stable signal, low power consumption, effective connection within 10 meters.
- HIFI Lossless Sound Quality: Supports decoding of FLAC and APE lossless music.
- One-Click Recording: Professional-grade recording capabilities with one-key save.
- Multiple Playback Modes: Supports TF memory card, U disk, and headphone playback.
- USB Fast Charging: Convenient charging with a built-in 750mAh polymer lithium battery.
- Digital Search Radio: Concise song/radio selection.
4. Specifications
| Feature | Specification |
|---|---|
| Product Name | Portable Bluetooth Speaker |
| Brand | SANSUI |
| Model | F21 |
| Voltage Range | USB (5-20V DC) |
| Weight | 500g |
| Input/Output | USB |
| Sound Mode | 3D Surround Sound Mode |
| Bluetooth Version | 5.0 |
| Input Power | 25-49 W |
| Material | Metal (Cabinet: Plastic) |
| Playback Function | MP3 |
| Power Source | Battery, USB |
| Channels | 2 (2.0) |
| Speaker Type | Portable |
| Support Memory Card | Yes |
| Radio Frequency Range | 70-108MHz |
| Speaker Configuration | 1.5 inch dual magnetic speaker |
| Rated Power | 3W |
| Frequency Response | 100Hz-18KHz |
| Battery Capacity | 750mAh polymer lithium battery |
| Body Size (L*W*H) | 104mm * 26mm * 61mm |
| Functions | BT 5.0, TF/USB Playback, FM Radio, Digital VOD, Lossless Music Play, Full Mode Recording, One-key Delete |
5. Setup and Charging
5.1. Charging the Device
- Connect the charging cable (USB-C / Micro USB) to the speaker's charging port and a suitable charger (DC 5V/1A).
- A red light indicator will illuminate, signifying that the device is charging.
- The red light will turn off once the battery is fully charged.
Charging Time: Approximately 2-3 hours.
Playing Time: 4-10 hours (depending on usage).
5.2. Power On/Off
- To Turn On/Off: Long press the Power button for 3 seconds.
6. Operating Instructions
6.1. Button Functions
- Power Button: Long press for 3 seconds to turn on/off. Short press to play/pause.
- Volume +: Short press to increase volume. Long press to skip to the next song.
- Volume -: Short press to decrease volume. Long press to go to the previous song.
- Mode Button (M): Switch between Bluetooth and AUX mode.
- LED Indicator:
- Blue flashing: Pairing mode.
- Blue always on: Connected (Bluetooth).
- Red: Charging.
6.2. Bluetooth Connection
- Long press the Power button to turn on the speaker.
- The LED indicator will flash blue, indicating it's in pairing mode.
- Open Bluetooth settings on your phone or other device, search for "BT-Speaker-01" (or similar name) and connect.
- Once connected, the LED indicator will show a solid blue light. You can now play music and answer calls.
6.3. AUX Mode
- Connect a 3.5mm audio cable (not included) to the speaker's AUX port and your audio device.
- The speaker will automatically switch to AUX mode.
6.4. FM Radio Operation
The SANSUI F21 supports FM radio with a frequency range of 70-108MHz, including campus radio stations.
6.5. TF Card / U Disk Playback
Insert a TF memory card or a USB flash drive into the respective slot. The device will automatically detect and play audio files (MP3, FLAC, APE) from the storage.
6.6. Recording Function
The SANSUI F21 supports one-touch full mode recording. Press the dedicated record button to start recording. Press again to stop and save the recording.
6.7. Headphone Playback
Connect headphones to the 3.5mm headphone jack for private listening.
6.8. Product Demonstration Video
7. Maintenance
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Keep the device away from water, high temperatures, and dusty environments.
- Store in a cool, dry place when not in use.
- Avoid dropping or subjecting the device to strong impacts.
8. Troubleshooting
- Cannot connect Bluetooth: Restart both the speaker and your phone/device, then attempt to reconnect.
- No sound: Check the volume level on both the speaker and the connected device. Ensure the correct connection mode (Bluetooth or AUX) is selected.
- Battery runs out fast: Ensure the device is fully charged. Lower the volume during playback to conserve battery life.
9. User Tips
- Deleting Songs: The device supports a 'one-key delete function' for recorded files or songs on inserted media. Look for a dedicated button or a combination press that might be indicated by a 'trash can' icon.
- Language: The manual provided with the product is in English.
10. Safety Warnings
- WARNING: Risk of fire, explosion and burns.
- Small parts are included. Keep away from children under 3 years old to prevent choking risk.
- Do not disassemble, puncture, or throw the battery into fire.
- Do not use the speaker in high temperature, humid, or dusty environments.
- Do not play at maximum volume for a long time to avoid hearing damage.
- Keep the speaker away from children under 3 years old to prevent choking hazard.
- Stop using immediately if there is overheating, smoke, or abnormal smell.
11. Warranty and Support
Warranty: 3 months
Service Email: support@123.com