Introducción
This instruction manual provides detailed information on the operation, features, and maintenance of your SONRU FM Transmitter Bluetooth Car Adapter. Please read this manual thoroughly before using the product to ensure proper function and safety.

Image: The SONRU FM Transmitter Bluetooth Car Adapter, a compact device designed to plug into a car's cigarette lighter socket, featuring a digital display, two USB charging ports (PD and QC3.0), and control buttons for music and calls.
Información de seguridad
- Calefacción: Protect against over-heating during fast charging.
- Interferencia inalámbrica: May experience interference with other wireless devices.
- Privacidad: Product includes a built-in microphone; be aware of privacy concerns.
Características del producto
- Tecnología Bluetooth 5.3 mejorada: The adapter utilizes an advanced Bluetooth 5.3 chip for faster, more stable, and smarter connections. It optimizes transmission delay and connection stability, providing high-fidelity music.

Image: A close-up showing the "Bluetooth 5.3" logo and a microchip, illustrating the advanced Bluetooth technology for fast connection, stable transmission, lower latency, and noise suppression.
- Puertos de carga rápida duales: Equipped with PD 30W and QC3.0 18W fast charging ports, allowing simultaneous high-speed charging of two devices. This design is 80% more efficient than standard chargers, enabling devices to charge from 0% to 80% in approximately 30 minutes.

Image: The FM transmitter with two USB ports labeled "PD 30W" and "QC 3.0 18W", indicating its dual fast charging capabilities. The image also shows a comparison bar graph highlighting 80% efficiency.
- Hands-Free Calling & Crystal Clear Sound: Features CVC8.0 noise cancellation and echo cancellation to reduce external environmental noise, ensuring clear hands-free calls. A dedicated call button facilitates easy hands-free calling for safer driving.

Image: A person driving and interacting with a voice assistant, with an overlay showing the FM transmitter and a phone displaying call options (answer, hang up, reject, redial). This illustrates the hands-free calling feature.
- Multifunctional FM Transmitter: Supports both Bluetooth and TF card playback (up to 32GB). It provides clear voice commands for safe driving, allowing activation of Siri or Google Assistant for phone calls. The device also features 7 colorful ambient lights.

Image: The FM transmitter shown in a car's console, highlighting two music playing modes: TF Card (with a 4GB card inserted) and Bluetooth (with a phone displaying a music player app). This demonstrates its versatility.

Image: The FM transmitter displaying various colorful light options (green, pink, blue, purple, cyan, yellow, white), indicating its customizable ambient lighting feature.
- Enhanced Safety & Guarantee: Provides multiple protections including over-heat, over-current, over-voltage, and short-circuit protection during device charging.
Instrucciones de instalación
- Insert into Cigarette Lighter Socket: Plug the FM transmitter into your car's 12V cigarette lighter socket. The device will power on and display the current FM frequency.
Video: A demonstration of plugging the SONRU FM Transmitter into a car's cigarette lighter socket and then tuning the car radio to an unused FM frequency. It then shows pairing a smartphone via Bluetooth to the device and playing music through the car's speakers.
- Sintonizar frecuencia FM: Find an empty FM frequency on your car radio (one with no static or active broadcast). Then, adjust the FM transmitter's frequency to match your car radio's frequency. This is typically done by long-pressing the "Next/FM+" or "Prev./FM-" buttons on the transmitter until the frequency display flashes, then short-pressing to adjust.
- Emparejar Bluetooth: On your smartphone, enable Bluetooth and search for available devices. Select "BC41" from the list to pair. Once connected, you can play audio from your phone through your car's speakers.
Instrucciones de funcionamiento
Funciones de los botones terminadasview

Image: A detailed diagram of the FM transmitter's buttons and ports, labeled with numbers and descriptions for easy identification and understanding of their functions.
- Micrófono: Para llamadas manos libres.
- Luz LED: Indicates device status and provides ambient lighting.
- Botón de luz colorida: Short press to switch light color; long press to activate LED breathing mode.
- Ranura para tarjetas TF: Insert a TF card (up to 32GB) for music playback.
- Cigarette Point and Shrapnel: For power connection in the car's socket.
- Ventana LED: Displays FM frequency and voltage.
- Puerto de carga rápida PD 30W: Carga de alta velocidad para dispositivos compatibles.
- QC3.0 18W Fast Charging Port: High-speed charging for compatible devices. Note: Only the right USB port (QC3.0) can serve as a USB reader for music playback from a U disk.
- Next/FM+ Button: Short press for next song/next FM frequency; long press to enter FM mode.
- Play/Pause/Answer/Redial Button: Short press to play/pause music, answer/hang up calls; long press to redial the last number.
- Prev./FM- Button: Short press for previous song/previous FM frequency; long press to wake up Siri/Google Assistant.
Reproducción de música
- Modo Bluetooth: Once paired, open your music app on your phone and start playback. Use the transmitter's buttons to control tracks (Next/Prev) and play/pause.
- Modo de tarjeta TF: Insert a TF card with MP3/WMA/WAV/FLAC audio files into the TF card slot. The device will automatically detect and play music. Use the transmitter's buttons for control.
- Modo de disco U: Insert a U disk with audio files into the QC3.0 USB port. The device will automatically detect and play music. Use the transmitter's buttons for control.
Llamadas manos libres
- Responder/Finalizar llamada: Presione brevemente el botón del teléfono para responder una llamada entrante o finalizar una llamada en curso.
- Rechazar llamada: Mantenga presionado el botón del teléfono para rechazar una llamada entrante.
- Rellamada Presione dos veces el botón del teléfono para volver a marcar el último número marcado.
Asistente de voz
- Activate Siri/Google Assistant: Long press the "Prev./FM-" button to activate your smartphone's voice assistant (Siri or Google Assistant).
Iluminación ambiental
- Cambiar el color: Short press the colorful light button to cycle through the 7 available colors.
- Modo respiración: Long press the colorful light button to activate the LED breathing mode, where colors fade in and out.
Mantenimiento
To ensure the longevity and optimal performance of your SONRU FM Transmitter, please follow these maintenance guidelines:
- Mantenga el dispositivo seco. La humedad puede dañar los circuitos internos.
- Evite temperaturas extremas. Las altas temperaturas pueden acortar la vida útil de los dispositivos electrónicos.
- No deje caer, golpee ni sacuda el dispositivo. Un manejo brusco puede romper las placas de circuitos internos.
- Limpie el dispositivo con un paño suave y seco. No utilice productos químicos ni detergentes agresivos.
- Asegúrese de que el enchufe del encendedor esté limpio y libre de residuos para una conexión segura.
Solución de problemas
| Problema | Posible causa | Solución |
|---|---|---|
| Sin energía/pantalla apagada | Loose connection; car socket issue; device fault. | Ensure the device is firmly plugged in. Check if the car's cigarette lighter socket is working. Try in another vehicle if possible. |
| Audio estático o de mala calidad | FM frequency interference; volume too low/high; poor Bluetooth connection. | Change to a different, unused FM frequency on both the transmitter and car radio. Adjust volume on both the phone and car radio. Re-pair Bluetooth. |
| No se puede emparejar Bluetooth | Bluetooth no habilitado; dispositivo no en modo de emparejamiento; interferencia. | Ensure Bluetooth is enabled on your phone. Restart both the transmitter and phone. Make sure no other devices are connected to the transmitter. |
| La carga es lenta o no funciona | Cable issue; device not compatible with fast charging; power output insufficient. | Use a high-quality charging cable. Ensure your device supports PD or QC3.0 fast charging. Check the power output requirements of your device. |
Presupuesto
- Dimensiones del producto: 1.7 x 1.3 x 2.7 pulgadas (1.7" de largo x 1.3" de ancho x 2.7" de alto)
- Peso del artículo: 1.1 onzas
- Número de modelo: BC41
- Tecnología de conectividad: Bluetooth 5.3
- Fuente de energía: Encendedor de coche con cable eléctrico
- Puertos de carga: PD 30W, QC3.0 18W
- Características especiales: Built-In Microphone, Fast Charging, Hands-Free Calls, Low Latency, Noise Cancellation, 7 Colorful LED Lights, TF Card/U Disk Playback
- Rango de frecuencia de FM: 87.5 - 108.0 MHz
Garantía y soporte
SONRU provides a 2-year warranty for this product. If you encounter any problems during use within this period, please contact us. We are committed to providing a satisfactory solution.
For further assistance, please visit the official SONRU store or contact customer support through your purchase platform.



