1. Introducció
Thank you for choosing the LENCENT C81 FM Transmitter Car Bluetooth 5.1 Modulator. This device allows you to stream music and make hands-free calls through your car's FM radio, while also providing fast charging capabilities for your mobile devices. Please read this manual carefully before use to ensure proper operation and safety.

Figure 1: LENCENT C81 FM Transmitter Car Bluetooth 5.1 Modulator
2. Informació de seguretat
- No exposeu el dispositiu a temperatures extremes, llum solar directa ni humitat.
- No desmunteu ni modifiqueu el dispositiu.
- Mantenir fora de l'abast dels nens.
- Ensure the car's cigarette lighter socket is clean and free of debris before inserting the device.
- Always pay attention to the road while driving. Use hands-free functions responsibly.
3. Producte acabatview
The LENCENT C81 features a compact design with intuitive controls and multiple functionalities.

Figure 2: Device controls including the large rotary knob, CH button, and phone call button.
- Pantalla LED: Shows FM frequency and voltage.
- Pom giratori: Rotate right for Volume+/FM+, rotate left for Volume-/FM-. Press to answer/end calls or play/pause music.
- Botó CH: Used to enter FM frequency adjustment mode.
- Botó de trucada telefònica: Premeu per respondre/finalitzar trucades.
- 'b' Button: Activates Deep Bass mode for enhanced audio.
- USB-C Port (PD 20W): Power Delivery fast charging port.
- Port USB-A (QC3.0 18 W): Quick Charge 3.0 fast charging port.
- Micròfon: Per a trucades de mans lliures i assistent de veu.
4. Especificacions
| Característica | Especificació |
|---|---|
| Marca | LENCENT |
| Model | C81 |
| Versió Bluetooth | V5.1 |
| QC Port Output | 18W (5V/3A, 9V/2A, 12V/1.5A) |
| Sortida del port PD | 20W (5V/3A, 9V/2A, 12V/1.5A) |
| Entrada Voltage | DC 12-24V |
| Formats de música | MP3, WMA, WAV, FLAC |
| Pes de l'article | 72 g |
| Mida de l'article | 11.2 cm x 7.3 cm x 5.5 cm |
| Material | ABS |
| Certificacions | CE, FCC, RoHS |
| Característiques especials | Hands-free, Hands-free Phone Call, Noise Cancellation, Fast Charge |
5. Instruccions de configuració
- Inseriu a la presa del cotxe: Plug the LENCENT C81 into your car's cigarette lighter socket. The LED display will light up, showing the current voltage and then the FM frequency.
- Sintonitza la freqüència FM:
- Press the 'CH' button. The FM frequency on the LED display will start flashing.
- Rotate the large knob left or right to select an empty FM frequency (one that is not occupied by a local radio station) on your car radio.
- Tune your car's FM radio to the same empty frequency.
- Wait a few seconds for the frequency to stop flashing, or press the 'CH' button again to confirm.
- Emparellament Bluetooth:
- Al dispositiu mòbil, activeu el Bluetooth i cerqueu els dispositius disponibles.
- Select 'C81' from the list to pair. Once connected, you will hear a confirmation tone.
6. Instruccions de funcionament
6.1 Reproducció de música
- Mitjançant Bluetooth: Once paired, music from your phone will automatically stream through your car's speakers. Use your phone or the rotary knob to control playback (play/pause, next/previous track).
- Via USB Drive: Insert a USB flash drive (containing MP3, WMA, WAV, FLAC files) into the USB-A port. The device will automatically detect and play music from the drive.

Figure 3: Switching between Standard and Deep Bass music modes.
6.2 Deep Bass Mode
- Press the 'b' button to activate Deep Bass mode for enhanced audio experience. Press it again to switch back to standard mode.
6.3 Trucades mans lliures
- Respondre/Finalitzar la trucada: Press the phone call button (or the rotary knob) once to answer an incoming call. Press it again to end the call.
- Rebutja la trucada: Press and hold the phone call button for 2 seconds to reject an incoming call.
- Torna a marcar: Double-press the phone call button to redial the last number.

Figure 4: Built-in microphone with superior noise suppression for clear hands-free calls.
6.4 Assistent de veu
- Press and hold the phone call button for 2 seconds to activate your phone's voice assistant (Siri, Google Assistant, Bixby). You can then use voice commands for navigation, making calls, etc.

Figure 5: Activating voice assistant for safer driving.
6.5 Dispositius de càrrega
- The device features a USB-C PD 20W port and a USB-A QC3.0 18W port for fast charging compatible devices. Connect your charging cable to the appropriate port.

Figure 6: USB-C PD 20W and USB-A QC3.0 18W fast charging ports.
7. Solució De Problemes
- Sense energia: Ensure the device is fully inserted into the car's cigarette lighter socket and that the car's power is on. Check the car's fuse for the cigarette lighter.
- Mala qualitat de so/estàtica:
- Ensure your car radio and the FM transmitter are tuned to the exact same empty FM frequency.
- Try a different empty FM frequency.
- Adjust the volume on both the transmitter and your car radio.
- Allunyeu-vos de fonts fortes d'interferències de ràdio.
- Desconnexió Bluetooth:
- Ensure the device is within range of your phone.
- Restart the transmitter and your phone's Bluetooth.
- Oblida't del dispositiu a la configuració de Bluetooth del telèfon i torna a emparellar-lo.
- La càrrega no funciona:
- Ensure your charging cable is working and properly connected.
- Verify your device supports PD or QC3.0 fast charging for optimal speed.
8. Consells d'usuari
- Selecció de freqüència FM: Always try to find the clearest possible FM frequency with no existing radio stations to minimize static and interference.
- CH Button Function: The 'CH' button is primarily for entering FM frequency adjustment mode, not for powering the device on/off. Power is typically controlled by inserting/removing the device or the car's ignition.
- Càrrega òptima: For the fastest charging, use a high-quality USB-C to USB-C cable for the PD port and a high-quality USB-A cable for the QC3.0 port, ensuring your device supports these fast charging standards.
- Voice Assistant Convenience: Utilize the voice assistant feature for hands-free navigation and communication, enhancing driving safety.
9. Manteniment
- Netegeu el dispositiu amb un drap suau i sec. No utilitzeu productes químics agressius ni netejadors abrasius.
- Keep the device free from dust and debris, especially the charging ports and microphone.
- Emmagatzemar en un lloc fresc i sec quan no s'utilitzi durant períodes prolongats.
10. Garantia i Suport
LENCENT provides a warranty and lifetime support for this product. For any issues or questions regarding your C81 FM Transmitter, please contact the seller or LENCENT customer support for assistance.





