Product Overview
The OneOdio A3 headphones are designed to provide a superior audio experience with Active Noise Cancelling (ANC) technology and aptX Low Latency support. These wireless over-ear headphones feature a built-in microphone for hands-free calls, comfortable protein ear pads, and a foldable design for portability. They are suitable for various uses including travel, work, and entertainment.
Key Features:
- Active Noise Cancelling: Effectively reduces low-frequency background noise for an immersive listening experience.
- aptX Low Latency: Minimizes audio delay for synchronized sound with video.
- Bluetooth 4.1 Connectivity: Provides stable and quick wireless connection.
- Built-in Microphone: Enables clear hands-free calls.
- Comfortable Design: Features soft protein ear cushions and 90-degree swiveling ear cups for extended wear.
- Foldable and Portable: Easy to store and carry with the included compact case.
- Long Battery Life: Up to 15 hours with ANC+BT, or 18 hours with BT only.

Image: Front view of the OneOdio A3 Active Noise Cancelling Bluetooth Headphones, showcasing their sleek black design and over-ear form factor.
Package Contents
Upon opening your OneOdio A3 headphones package, you should find the following items:
- OneOdio A3 Headphones
- USB Charging Cable
- 3.5mm Audio Cable
- Compact Carrying Case
- User Manual
- Airplane Adapter (if included in specific regional packages)

Image: Contents of the OneOdio A3 headphone package, including the headphones, compact case, charging cable, audio cable, and user manual.
Setup
1. Charging the Headphones
Before first use, fully charge your OneOdio A3 headphones. Connect the provided USB charging cable to the charging port on the headphones and the other end to a USB power source (e.g., computer USB port, wall adapter). The LED indicator will show charging status.
- Charging Time: Approximately 2 hours for a full charge.
- LED Indicator: Red light indicates charging, blue light indicates fully charged.
2. Powering On/Off
- Power On: Press and hold the Multi-function Button for 3 seconds until the LED indicator flashes blue.
- Power Off: Press and hold the Multi-function Button for 3 seconds until the LED indicator turns off.
3. Bluetooth Pairing
To connect your headphones wirelessly to a device:
- Ensure the headphones are powered off.
- Press and hold the Multi-function Button for 5-7 seconds until the LED indicator flashes red and blue alternately, indicating pairing mode.
- On your device (smartphone, tablet, PC), enable Bluetooth and search for "OneOdio A3" in the list of available devices.
- Select "OneOdio A3" to connect. Once connected, the LED indicator will flash blue slowly.
NFC Pairing (if supported by your device):
With NFC enabled on your device, simply tap your device against the NFC area on the left earcup of the headphones to initiate pairing. Follow any on-screen prompts.
Operating Instructions

Image: Diagram illustrating the location and function of buttons and ports on the OneOdio A3 headphones, including the Multi-function Button, volume controls, ANC button, and 3.5mm Aux Port.
Button Functions:
| Button/Control | Function |
|---|---|
| Multi-function Button |
|
| Volume Up (+) |
|
| Volume Down (-) |
|
| ANC Button |
|
| 3.5mm Aux Port | Connect for wired listening (ANC can still be used). |
Active Noise Cancelling (ANC)
The ANC feature reduces ambient low-frequency noise. To activate or deactivate ANC, press the dedicated ANC button. The ANC indicator light will illuminate when ANC is active.
Note: ANC is most effective at reducing consistent low-frequency sounds like engine hums, air conditioning noise, or train sounds. It may not completely eliminate sudden or high-frequency noises like voices or car horns.

Image: Visual representation of the Active Noise Cancelling feature on the OneOdio A3 headphones, showing how it reduces ambient noise.
Wired Mode
You can use the OneOdio A3 headphones in wired mode by connecting the provided 3.5mm audio cable to the headphone's Aux port and your audio source. This mode is useful when the battery is low or for devices without Bluetooth. ANC can still be activated in wired mode.
Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the headphones. Do not use abrasive cleaners or solvents.
- Storage: When not in use, store the headphones in their compact carrying case to protect them from dust and damage.
- Battery Life: To prolong battery life, avoid fully discharging the headphones frequently. Charge them regularly.
- Comfort: For optimal comfort during long listening sessions, it is recommended to take off the headphones every 2-3 hours to allow your ears to rest.
- Water Resistance: The headphones have an IPX4 waterproof rating, meaning they are resistant to splashing water. Do not submerge them in water or expose them to heavy rain.
Troubleshooting
No Power / Cannot Turn On:
- Ensure the headphones are fully charged. Connect them to a power source and check the LED indicator.
Cannot Pair with Bluetooth Device:
- Make sure the headphones are in pairing mode (LED flashing red and blue alternately).
- Ensure Bluetooth is enabled on your device and it is within 10 meters (33 feet) of the headphones.
- Try forgetting "OneOdio A3" from your device's Bluetooth list and re-pairing.
- Restart both the headphones and your device.
No Sound / Low Volume:
- Check the volume levels on both the headphones and your connected device.
- Ensure the headphones are properly connected via Bluetooth or the 3.5mm audio cable.
- If using wired mode, ensure the cable is fully inserted into both ports.
ANC Not Working Effectively:
- Ensure the ANC feature is turned on (ANC indicator light is illuminated).
- Remember that ANC is most effective against consistent low-frequency noises and may not eliminate all sounds.
Specifications
| Feature | Detail |
|---|---|
| Product Name | OneOdio A3 (aptX Low Latency Active Noise Cancelling Headphones) |
| Model | A3 |
| Noise Control | Active Noise Cancellation |
| Bluetooth Version | V4.1 |
| Bluetooth Range | 10m / 33ft |
| Driver Diameter | 40mm |
| Impedance | 32Ω |
| Frequency Response | 20-20kHz |
| Using Time (ANC+BT) | Up to 15 hours |
| Using Time (BT only) | Up to 18 hours |
| Charging Time | Approximately 2 hours |
| Net Weight | 165g |
| Waterproof Rating | IPX4 |
| Headphones Jack | 3.5 mm Jack |
| Microphone Format | Built-In |
| Product Dimensions | 15 x 22 x 5 cm |
Warranty and Support
Warranty Information:
The OneOdio A3 headphones come with a 2 Month Warranty from the date of purchase. This warranty covers manufacturing defects. Please retain your proof of purchase for warranty claims.
Customer Support:
For any questions, technical assistance, or warranty claims, please contact OneOdio customer support. You can find more information and contact details on the official OneOdio store page:





