Introduction
Thank you for choosing the UGREEN Bluetooth 5.2 Transmitter/Receiver. This versatile 2-in-1 device allows you to wirelessly transmit audio from non-Bluetooth devices (like airplane entertainment systems, TVs, or MP3 players) to your Bluetooth headphones or speakers, and also receive audio from your Bluetooth-enabled devices (like smartphones or tablets) to wired audio systems (such as car stereos or home amplifiers). This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance.
Safety Information
Always unplug the wireless audio adapter from the power source when not in use for extended periods to prevent electrical surges or overheating.
Package Contents
- UGREEN Bluetooth 5.2 Transmitter/Receiver
- USB-C Charging Cable
- User Manual
Product Overview

Figure 1: UGREEN Bluetooth 5.2 Transmitter/Receiver
The UGREEN Bluetooth 5.2 Transmitter/Receiver is a compact and portable audio solution. It features a flexible 3.5mm audio jack, a mode switch (TX/RX), a multi-function button, and a USB-C charging port. The device is designed for ease of use and high-quality audio transmission.
Key Features:
- Bluetooth 5.2: Provides faster speed, lower power consumption, and longer range for stable connections.
- 2-in-1 Functionality: Operates as both a transmitter (TX) and a receiver (RX).
- Extended Battery Life: Up to 28 hours in TX mode and 20 hours in RX mode on a single charge.
- Dual Pairing: Connects to two Bluetooth headphones or speakers simultaneously in TX mode.
- Built-in Microphone: Supported in RX mode for hands-free calls.
Specifications:
| Product Dimensions | 0.98 x 0.47 x 2.13 inches |
| Item Weight | 3.37 ounces |
| Model Number | 35222 |
| Batteries | 1 Lithium Metal battery (included) |
| Connectivity Technology | AUX, Bluetooth 5.2 |
| Power Source | Battery Powered |
| Manufacturer | Ugreen Group Limited |
| Country of Origin | China |
Setup
Charging the Device:
Before first use, fully charge the UGREEN Bluetooth adapter. Connect the included USB-C charging cable to the device's USB-C port and the other end to a standard USB power adapter (not included). The indicator light will show charging status and turn off when fully charged.

Figure 2: Charging and Battery Life
Operating Modes
The UGREEN adapter features a TX/RX switch to select between Transmitter and Receiver modes. Ensure the device is in the correct mode for your intended use.

Figure 3: TX and RX Mode Overview
1. Transmitter Mode (TX)
In TX mode, the adapter transmits audio from a non-Bluetooth device to your Bluetooth headphones or speakers. This is ideal for airplane entertainment systems, TVs, or gym equipment.
- Slide the switch to the TX position. The indicator light will flash, indicating it's in pairing mode.
- Plug the 3.5mm audio jack into the audio output port of your non-Bluetooth device (e.g., airplane seat audio jack, TV headphone jack).
- Put your Bluetooth headphones or speakers into pairing mode.
- The adapter will automatically search for and connect to your Bluetooth device. Once connected, the indicator light will turn solid.
- Dual Pairing: To connect a second pair of Bluetooth headphones/speakers, put the second device into pairing mode. Press the multi-function button on the UGREEN adapter once. The adapter will search and connect to the second device.

Figure 4: Using TX Mode on an Airplane

Figure 5: Sharing Audio with Two Headsets in TX Mode

Figure 6: Using TX Mode with Gym Equipment
Video 1: UGREEN Airplane Bluetooth 5.2 Transmitter Adapter in action. This video demonstrates the adapter's use in an airplane setting, allowing wireless headphone connection to in-flight entertainment.
Video 2: UGREEN Airplane Bluetooth 5.2 Transmitter overview. This video provides a concise demonstration of the transmitter's features and how it connects to various audio sources.
2. Receiver Mode (RX)
In RX mode, the adapter receives audio from your Bluetooth-enabled device (e.g., smartphone, tablet) and plays it through a wired audio system (e.g., car stereo, home amplifier, wired headphones).
- Slide the switch to the RX position. The indicator light will flash, indicating it's in pairing mode.
- Plug the 3.5mm audio jack into the audio input port of your wired audio system (e.g., AUX-in port of a car stereo, input on an amplifier).
- On your smartphone or tablet, enable Bluetooth and search for "UGREEN-XXXX" (where XXXX is a unique identifier). Select the device to pair.
- Once connected, the indicator light will turn solid. You can now stream audio wirelessly from your device to the wired system.
- Microphone Use: In RX mode, the built-in microphone is active, allowing for hands-free calls when connected to a smartphone.

Figure 7: Using RX Mode in a Car

Figure 8: Using RX Mode with a Speaker
Maintenance
- Keep the device dry. Avoid exposure to moisture or liquids.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Store the device in a cool, dry place when not in use.
- Avoid extreme temperatures, as this can shorten the lifespan of the battery and electronic components.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Device does not power on. | Ensure the device is fully charged. Connect it to a power source using the USB-C cable. |
| Cannot pair with Bluetooth device. |
|
| No sound or poor audio quality. |
|
| Static or intermittent audio. |
|
Warranty and Support
UGREEN products come with a manufacturer's warranty. For detailed warranty information, technical support, or customer service, please refer to the warranty card included in your package or visit the official UGREEN website. You can also contact UGREEN customer support directly through their provided contact channels.