1. Introducció
Thank you for choosing the UGREEN Bluetooth 5.4 Audio Adapter. This versatile 2-in-1 device functions as both a Bluetooth transmitter (TX) and receiver (RX), allowing you to add wireless audio capabilities to a wide range of devices. Featuring Bluetooth 5.4 for stable signal transmission, an intuitive OLED display, and a built-in microphone for hands-free calling, this adapter is designed to enhance your audio experience in your car, home stereo system, and more.

Image: The UGREEN Bluetooth 5.4 Audio Adapter, showcasing its 2-in-1 transmitter and receiver functionality.
2. Contingut del paquet
Si us plau, comproveu el paquet per veure si hi ha els elements següents:
- UGREEN Bluetooth 5.4 Audio Adapter (Model: BT303)
- Manual d'usuari

Image: The retail packaging of the UGREEN Bluetooth Audio Receiver/Transmitter, highlighting its plug-and-play nature, LED display, and ability to pair with two devices simultaneously.
3. Producte acabatview
Familiarize yourself with the components of your UGREEN Bluetooth Audio Adapter:

Image: Diagram illustrating the components of the UGREEN Bluetooth Adapter, including the 3.5mm Audio Connector, Microphone, Slide Switch (TX/RX), USB-A Connector (for Power Supply), Coiled Cable, and the OLED Display Screen with indicators for Mode, Codecs, Volume Level, Bluetooth Name, and Connected Devices.
- Connector d'àudio de 3.5 mm: Connects to audio input/output ports of devices.
- Micròfon: Built-in for hands-free calling.
- Slide Switch (TX/RX): Alterna entre els modes transmissor (TX) i receptor (RX).
- Connector USB-A: Provides power to the adapter.
- Cable en espiral: Flexible cable for convenient connection, extends from 0.5m to 1.5m.
- Botó de funció: Multi-function button for various controls (e.g., play/pause, answer/end calls).
- Pantalla OLED: Shows current mode (TX/RX), audio codecs (SBC/AAC), volume level, Bluetooth name, and connected devices.

Image: Close-up of the UGREEN Bluetooth Adapter's OLED display screen, showing a "Hello!" message, indicating visual operation.
4. Especificacions
| Característica | Detall |
|---|---|
| Model | BT303 |
| Versió Bluetooth | 5.4 |
| Bluetooth Profiles | A2DP, AVRCP, HFP, HSP |
| Còdecs d'àudio | SBC, AAC |
| Distància de transmissió | Fins a 10 metres (transmissió lineal sense barreres) |
| Interfície | 3.5mm Audio Jack, USB-A (for power) |
| Tipus de cable | Coiled Cable (TPE material, anti-winding) |
| Longitud del cable | 0.5m - 1.5m (extended) |
| Mostra | Pantalla OLED |
| Micròfon | Integrat |
| Funcionalitat | Transmissor (TX) i receptor (RX) 2 en 1 |
| Connexió de punts múltiples | Supports one-to-two pairing |

Image: Illustration of Bluetooth 5.4 technology ensuring stable signal transmission up to 10 meters.
5. Instruccions de configuració
5.1 Powering the Adapter
Connect the USB-A connector of the adapter to a USB power source (e.g., car USB port, USB wall charger, power bank, or computer USB port). The OLED display will light up, indicating the device is powered on.
5.2 Selecting Mode (TX/RX)
Use the slide switch on the side of the adapter to select your desired mode:
- Mode TX (transmissor): To send audio wirelessly from a non-Bluetooth device (e.g., TV, PC, MP3 player) to Bluetooth headphones or speakers.
- Mode RX (receptor): To receive audio wirelessly from a Bluetooth device (e.g., smartphone, tablet, laptop) and play it through a non-Bluetooth audio system (e.g., car stereo, wired speakers, wired headphones).

Image: Close-up of the one-key slide switch for selecting Transmitter (TX) or Receiver (RX) mode.
5.3 RX Mode Setup (Receiving Audio)
- Switch the adapter to Mode RX.
- Connect the 3.5mm audio connector of the adapter to the AUX input of your car stereo, wired speaker, or wired headphones.
- Al telèfon intel·ligent, la tauleta o l'ordinador portàtil, activeu el Bluetooth i cerqueu els dispositius disponibles.
- Select "UGREEN-BT303" (or similar name displayed on the OLED screen) from the list to pair.
- Once paired, the OLED display will show "Connected" and the name of your device. You can now stream audio wirelessly.

Image: The UGREEN Bluetooth Adapter connected in a car's console, demonstrating its use in Receiver Mode to stream music from a smartphone to the car's audio system. Note: Both USB-A and 3.5mm aux cables must be plugged in for operation.
5.4 TX Mode Setup (Transmitting Audio)
- Switch the adapter to Mode TX.
- Connect the 3.5mm audio connector of the adapter to the audio output (e.g., headphone jack) of your non-Bluetooth device (e.g., TV, PC, game console).
- Poseu els auriculars o l'altaveu Bluetooth en mode d'emparellament.
- The adapter will automatically search for and connect to nearby Bluetooth audio devices. The OLED display will show "Pairing..." and then "Connected" with the device name once successful.
- You can now enjoy audio from your non-Bluetooth device wirelessly through your Bluetooth headphones/speakers.

Image: The UGREEN Bluetooth Adapter connected to a TV, demonstrating its use in Transmitter Mode to send audio to Bluetooth headphones for private listening.
6. Instruccions de funcionament
Reproducció d'àudio bàsica 6.1
Once successfully paired in either TX or RX mode, audio will automatically stream. Use the controls on your connected device (smartphone, TV, headphones) to manage playback (play/pause, skip tracks, volume).
6.2 Hands-Free Calling (RX Mode Only)
When the adapter is in RX mode and connected to your smartphone, the built-in microphone enables hands-free calling:
- Respondre/Finalitzar la trucada: Press the Function Button once.
- Rebutja la trucada: Press and hold the Function Button for 2 seconds.
- Torna a marcar l'últim número: Double-press the Function Button.

Image: A person driving and using the UGREEN Bluetooth Adapter for hands-free calling, emphasizing safety with the built-in microphone.

Image: Screenshots showing a smartphone's Bluetooth settings connected to "Ugreen-45236", a call interface, and a navigation screen, illustrating the hands-free calling and navigation features.
6.3 One-to-Two Pairing (Multi-point Connection)
The adapter supports connecting to two Bluetooth devices simultaneously:
- En mode RX: Connect two smartphones/laptops to the adapter to switch between audio sources without re-pairing.
- En mode TX: Connect the adapter to two Bluetooth headphones/speakers to share audio from a single source.
To enable one-to-two pairing:
- Pair the first device as described in the setup section.
- Once the first device is connected, put the second Bluetooth device into pairing mode (or enable Bluetooth on the second source device).
- The adapter will automatically search for and connect to the second device. The OLED display will show both connected devices.

Image: The UGREEN Bluetooth Adapter connected to a speaker, with two smartphones simultaneously connected to the adapter, demonstrating the one-to-two pairing feature.
7. Manteniment
- Mantingueu el dispositiu sec. Eviteu l'exposició a la humitat o a líquids.
- No intenteu desmuntar o modificar el dispositiu.
- Netegeu el dispositiu amb un drap suau i sec. No utilitzeu productes de neteja abrasius ni dissolvents.
- Guardeu el dispositiu en un lloc fresc i sec quan no l'utilitzeu.
- Eviteu temperatures extremes.
8. Solució De Problemes
| Problema | Possible solució |
|---|---|
| No power/OLED display off | Assegureu-vos que el connector USB-A estigui ben connectat a una font d'alimentació USB que funcioni. Proveu un altre port USB o adaptador de corrent. |
| No es pot vincular amb un dispositiu |
|
| No hi ha so o mala qualitat d'àudio |
|
| Hands-free calling not working |
|
9. Consells d'usuari
- For optimal audio quality, ensure your audio source provides a clean signal to the 3.5mm input.
- When using in a car, ensure the USB power source provides stable power to prevent interruptions.
- The coiled cable is designed for flexibility; avoid excessive stretching to maintain its integrity.
- If experiencing occasional disconnections, try moving the adapter to a location with fewer obstructions or electromagnetic interference.
10. Garantia i Suport
Els productes UGREEN inclouen una garantia estàndard del fabricant. Per obtenir informació detallada sobre la garantia, assistència tècnica o consultes de servei, consulteu la targeta de garantia inclosa al paquet o visiteu el lloc web oficial d'UGREEN. weblloc.
Conserveu el vostre comprovant de compra per a reclamacions de garantia.





