1. Product Overview
The UGREEN Bluetooth 5.2 Transmitter Receiver (Model 35222A) is a versatile 2-in-1 wireless audio adapter designed to enhance your audio experience. It functions as both a Bluetooth transmitter (TX mode) and a Bluetooth receiver (RX mode), allowing you to connect various audio devices wirelessly. This device is ideal for use with airplane entertainment systems, TVs, car stereos, treadmills, and other equipment featuring a 3.5mm audio jack.
Figure 1: UGREEN Bluetooth Transmitter Receiver (Model 35222A) and included airplane adapter.
Key Features:
- 2-in-1 Functionality: Seamlessly switch between Transmitter (TX) and Receiver (RX) modes.
- Bluetooth 5.2: Provides faster speed, lower power consumption, and an extended wireless range.
- Long Battery Life: Up to 28 hours in TX mode and 20 hours in RX mode, suitable for long journeys.
- Dual Pairing: Connects to two Bluetooth headphones or speakers simultaneously for shared audio.
- Wide Compatibility: Works with any device featuring a 3.5mm audio output (TX) or input (RX).
- Built-in Microphone: Supports hands-free calls in RX mode.
Figure 2: The UGREEN adapter offers 2-in-1 functionality as both a Bluetooth transmitter and receiver.
2. Setup Guide
2.1 Package Contents
Before proceeding, ensure all items are present:
- UGREEN Bluetooth Transmitter Receiver (Model 35222A)
- 3.5mm AUX Audio Cable (integrated)
- Airplane Audio Adapter (dual-prong)
- USB-C Charging Cable
- User Manual (this document)
2.2 Charging the Device
The device comes with a built-in rechargeable battery. For optimal performance, fully charge the device before first use.
- Connect the provided USB-C charging cable to the USB-C port on the UGREEN adapter.
- Connect the other end of the USB-C cable to a standard USB power adapter (5V/1A recommended, not included) or a computer's USB port.
- The LED indicator will show charging status (e.g., red while charging, off when fully charged).
- A full charge typically takes approximately 2 hours.
Figure 3: The device features a USB-C charging port and offers up to 28 hours of battery life.
2.3 Powering On/Off
- Power On: Press and hold the multi-function button (usually indicated by a circle or power symbol) for approximately 3 seconds until the LED indicator lights up.
- Power Off: Press and hold the multi-function button for approximately 3 seconds until the LED indicator turns off.
3. Operating Instructions
3.1 Switching Between TX (Transmitter) and RX (Receiver) Modes
The UGREEN adapter has a physical switch or button to toggle between TX and RX modes. Locate the TX/RX switch on the side of the device and slide it to the desired mode.
Figure 4: Visual representation of TX and RX modes and compatible devices.
3.2 Transmitter Mode (TX)
In TX mode, the adapter transmits audio from a non-Bluetooth device (e.g., airplane entertainment, TV, computer) to your Bluetooth headphones or speakers.
- Set the adapter to TX mode.
- Plug the 3.5mm audio jack of the adapter into the audio output port of your source device (e.g., airplane seat, TV headphone jack). If using on an airplane with dual-prong jacks, attach the included airplane adapter first.
- Power on the adapter. It will automatically enter pairing mode (LED indicator will flash rapidly, typically blue).
- Put your Bluetooth headphones or speaker into pairing mode. Refer to your headphone/speaker manual for specific instructions.
- Place the adapter and your Bluetooth audio device close to each other. They should pair automatically within a few seconds. The LED indicator on the adapter will turn solid (e.g., blue) once connected.
- Adjust the volume on your headphones/speaker or the source device.
Figure 5: Using the UGREEN adapter in TX mode to connect Bluetooth headphones to an airplane's audio system.
Figure 6: Connecting a TV to wireless headphones using the adapter in TX mode.
Dual Pairing in TX Mode:
To connect two Bluetooth headphones/speakers simultaneously:
- Connect the first Bluetooth device as described above.
- Once the first device is connected, quickly double-press the multi-function button on the UGREEN adapter to enter pairing mode again. The LED will flash.
- Put the second Bluetooth headphones/speaker into pairing mode.
- Place the adapter and your Bluetooth audio device close to each other. The adapter will connect to the second device. Both devices will now receive audio.
Figure 7: Dual pairing allows two users to enjoy audio simultaneously in TX mode.
3.3 Receiver Mode (RX)
In RX mode, the adapter receives audio from your Bluetooth-enabled device (e.g., smartphone, tablet) and outputs it to a non-Bluetooth audio system (e.g., car stereo, home amplifier, wired headphones).
- Set the adapter to RX mode.
- Plug the 3.5mm audio jack of the adapter into the AUX input port of your target audio system (e.g., car stereo, wired speaker).
- Power on the adapter. It will automatically enter pairing mode (LED indicator will flash rapidly, typically blue).
- On your smartphone, tablet, or other Bluetooth-enabled device, go to Bluetooth settings and search for "UGREEN-XXXX" (where XXXX is a unique identifier).
- Select the UGREEN device to pair. The LED indicator on the adapter will turn solid once connected.
- Play audio on your source device. The sound will now be routed through the UGREEN adapter to your connected audio system.
- Adjust the volume on your source device or the connected audio system.
Figure 8: Connecting a mobile phone to car audio via the adapter in RX mode for music and hands-free calls.
Figure 9: Connecting a smartphone to a speaker using the adapter in RX mode.
Hands-Free Calling (RX Mode Only):
When in RX mode and connected to your smartphone, the built-in microphone allows for hands-free calls. When a call comes in, press the multi-function button once to answer, and press again to end the call.
Dual Pairing in RX Mode:
To connect two Bluetooth-enabled devices (e.g., two smartphones) to the adapter simultaneously:
- Connect the first Bluetooth device as described above.
- Once the first device is connected, quickly double-press the multi-function button on the UGREEN adapter to enter pairing mode again. The LED will flash.
- On the second Bluetooth-enabled device, search for and connect to the UGREEN adapter.
- Both devices will now be connected, and audio can be played from either device (one at a time).
Figure 10: Dual pairing in RX mode allows two source devices to connect to the adapter.
4. Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or aerosols.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the device regularly, even if not in use for extended periods.
- Safety Information:
- Do not expose to extreme temperatures.
- Handle batteries with care.
- Avoid interference with other wireless devices.
- Do not attempt to disassemble or repair the device yourself. This will void the warranty.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low battery. | Charge the device fully using the provided USB-C cable. |
| Cannot pair with Bluetooth headphones/speaker. |
|
|
| No audio or poor audio quality. |
|
|
| Cannot connect a second device for dual pairing. | Second device not in pairing mode or procedure not followed correctly. | After connecting the first device, quickly double-press the multi-function button on the adapter to re-enter pairing mode for the second device. Ensure the second device is also in pairing mode. |
| Microphone not working in RX mode. | Microphone functionality is only supported in RX mode. | Ensure the adapter is set to RX mode and properly connected to your smartphone. |
Resetting the Device:
If you experience persistent issues, you may need to reset the adapter. Locate the small reset button (often a pinhole) and use a paperclip or similar thin object to press and hold it for a few seconds until the device restarts or the LED indicators reset.
6. Product Specifications
| Feature | Detail |
|---|---|
| Model Number | 35222A |
| Bluetooth Version | 5.2 |
| Bluetooth Profiles | A2DP, AVRCP (specific profiles not explicitly listed, common for audio) |
| Operating Modes | Transmitter (TX), Receiver (RX) |
| Audio Interface | 3.5mm AUX Jack |
| Battery Life (TX Mode) | Up to 28 hours |
| Battery Life (RX Mode) | Up to 20 hours |
| Charging Port | USB-C |
| Charging Time | Approximately 2 hours |
| Dimensions | 0.98 x 0.47 x 2.13 inches (2.21"L x 1"W x 0.51"H) |
| Item Weight | 3.87 ounces |
| Special Features | 27H Battery Life, Bluetooth 5.2, Built-In Microphone, Receiver Transmitter 2 in 1 |
| Connectivity Technology | Wireless |
| Power Source | Battery Powered (1 Lithium Metal battery included) |
Figure 11: The compact and portable design of the UGREEN Bluetooth adapter, with dimensions.
7. Warranty and Support
7.1 Warranty Information
UGREEN products typically come with a standard manufacturer's warranty. Please refer to the warranty card included in your product packaging or visit the official UGREEN website for the most up-to-date warranty terms and conditions specific to your region.
The warranty generally covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or natural disasters.
7.2 Customer Support
For technical assistance, troubleshooting, or warranty claims, please contact UGREEN customer support through one of the following methods:
- Official Website: Visit www.ugreen.com for FAQs, support resources, and contact forms.
- Email Support: Refer to your product packaging or the UGREEN website for the appropriate support email address.
- Online Retailer Support: If purchased from an online retailer like Amazon, you may also contact their customer service for assistance with returns or exchanges within their policy period.
Please have your product model number (35222A) and purchase information ready when contacting support.
