Quick start guide

A2 - User Guide - First-time setup

Congratulations on receiving your new pair of A2! Use this guide to learn about pairing A2 with your preferred device, charging the batteries, and restoring the earphones to their factory settings. 

What's included in the box


  • A2 wireless earphones and charging case
  • Interchangeable ear tips in five different sizes: XS, S, M, L & XL
  • Type-C USB-cable
  • Microfiber cloth
  • Owners manual

Before getting started

⚠️  Sudio A2 is delivered with a red protective film covering the charging connectors between the earbuds and charging case. The film needs to be removed in order for the earbuds to power on.

The earbuds will likely have some existing battery charge, however it is recommended to fully charge A2 before using it for the first time.  


Turning A2 on or off


A2 powers up as soon as the earbuds are removed from the charging case.

Similarly, A2 is turned off when placing the earbuds back into the case. 

You can also use the touch controls to power the earbuds off. Do this by holding the touch control for 6 seconds on either earbud. 

Pairing with a device

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A2 enters pairing mode when the earbuds are removed from the charging case. Open the Bluetooth settings on your device and wait for A2 and the device to locate each other, then select Sudio A2  when it appears in the list. You will hear 🔈 Connected, confirming that the devices are paired with each other!

Charging the batteries

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There are three batteries in total on A2; one in the charging case and one in each earbud.

The A2 earbuds charge their batteries automatically when placed inside the charging case, this is indicated by the LED lights on the charging case. Make sure to first remove the protective film which is covering the charging connectors.

The A2 case is charged with a Type-C USB-cable and can also be charged wirelessly. When the case is charging, you will see several lights on the front of the charging case. It is recommended to use the Sudio Type-C USB-cable that's included in the package, but the charging case may be compatible with third-party Type-C USB-cables as well.

Restoring A2 to factory settings

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If A2 is behaving unexpectedly or you simply wish to restore it to its original settings, reset it by taking the earbuds out of the case and touching (holding) the touch points on both earbuds for 6-8 seconds until you hear Power Off. Then release and touch (hold) the touch points on both earbuds for 8 seconds again until you hear 3 clicks. Leave the earbuds close to one another until they resynchronize with each other. 

You may then proceed with pairing A2 again.

A2 - User guide - Connectivity & Pairing

Sudio A2 enters pairing mode immediately when the earbuds are removed form the charging case. When pairing A2 for the first time, you hear 🔈 On followed by 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device.

⚠️  Sudio A2 is delivered with a red protective film covering the charging connectors between the earbuds and charging case. The film needs to be removed in order for the earbuds to power on.

Pairing A2 with a device

  1. Remove the A2 earbuds from the charging case and fit them inside your ears.
  2. Go into the Bluetooth settings on your device. 
    • For iOS (iPhone), go to the Settings app and select Bluetooth.
    • For Android, go to the Settings app, then select Connections followed by Bluetooth.
    • For Windows 10, click on the Start button, select Settings followed by Devices, and then Bluetooth and other devices.
    • For macOS, go to the System Preferences app and select Bluetooth.
  3. Locate and select Sudio A2 in the Bluetooth list on your device.
  4. When paired you will hear the audio feedback 🔈 Connected.

If A2 has previously been paired with your preferred device, simply remove the earbuds from the charging case and they will automatically connect, so long as Bluetooth is activated on the device and A2 has not been paired with a different device more recently. 

Device compatibility

A2 uses Bluetooth version 5.2 which is compatible with a wide range of Bluetooth devices. The paired device does not need to be the same version, but similar versions are more likely to maintain a strong connection. 

Signal interference

Some wireless devices may interfere with each others' signals, such as WiFi-routers, smartwatches, other Bluetooth devices, etc. If they operate within the same frequency, you may experience interference such as dropped sound and glitching. The easiest way to locate the cause of interference is by maintaining one connection between devices at the same time or take your A2 and connected device outdoors to see if the interference clears.

A2 can be up to a maximum of 10 meters (32 ft) from the paired device, but the connection may break if they are blocked by walls or similar objects. 

Pairing with multiple devices

A2 can remember up to 10 devices and will pair automatically with the last used device. In most cases, you can switch between devices by selecting Sudio A2 in the Bluetooth list which pairs it with that device instead. However, some devices require A2 to be disconnected from the previous device entirely before they can be paired. It’s not possible to keep A2 connected to several devices at the same time, such as a laptop and smartphone simultaneously.

A2 - User guide - Touch controls

A2 has a touch control button on each earbud that allows you to control certain features on your paired device.

Music/video playback


  • Touch once on either earbud (left or right) to play or pause
  • Touch twice on the left earbud to rewind
  • Touch twice on the right earbud to go forward
  • Touch three times on the left earbud to decrease volume
  • Touch three times on the right earbud to increase volume

Incoming phone calls


  • Touch once on either earbud (left or right) to accept a phone call
  • Touch (hold) for two seconds on either earbud (left or right) to reject or end a phone call*

*It's not possible to end a call using the touch controls while using third-party conference software due to different software protocols. 

Active Noise Cancellation



A2 powers on and off automatically when the earbuds are taken out or put back inside the case. However, you can also control this without using the charging case.  

  • Touch (hold) for six seconds on either earbud to power off (both earbuds). After 2 seconds the listening mode will change, followed by 🔈 Off.

A2 - User guide - Factory reset


If A2 starts behaving unexpectedly, or if you wish to remove the connection between A2 and the connected device, you can perform a factory reset to restore your Sudio A2 to its original settings. This will reset the connection between your paired devices, as well as the connection between the two earbuds.

  1. Take the earbuds out of the charging case.
  2. Wait until the earbuds have gone through the voice feedback saying: 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device. Then proceed with pressing and holding both touch points on the earbuds for 6-8 seconds until you hear Power Off.
  3. Release the touch button, and once again hold both touch points of the earbuds for 6-8 seconds until you hear 3 clicking sounds.
  4. Leave the earbuds out of the case and close to one another for 20 seconds so they can resynchronize. 
  5. Place the earbuds back in the case and close the lid and allow 1 minute before using the earphones again.

When you hear 🔈 Ready to pair, find your Sudio product in the Bluetooth list of your device, proceed to pair them with your Bluetooth device.

A2 - User guide - Battery levels and management

A2 has three built-in batteries; one inside the charging case and one in each earbud. The battery inside the case is used to charge the earbuds, while the included Type-C USB-cable is used to charge the case.

Before using your A2 for the first time

⚠️  Sudio A2 is delivered with a protective film covering the charging connectors between the earbuds and charging case. The film needs to be removed in order for the earbuds to power on.

Charging and play times

The earbuds can be used for approximately 9.5 hours on one charge (6.5 hours while using ANC), with up to 30 hours in total before the case needs to be recharged.

The earbuds take approximately 1.5 hours to fully charge and the charging case 2 hours. 

Charging methods

The A2 case can be charged with a Type-C USB-cable, wireless charging is not supported. We recommend using the Sudio cable included in the package, however, other third-party Type-C USB-cables may be compatible too.

Battery level indicators

There are four LED-lights that indicate the charging cases' and the earbuds' remaining level. The indicating lights are on the front of the case. 

The LED's light up when the earbuds connect and disconnect to the case.

When inserting the charging cable to the case, the blinking light on the case indicates that the case is currently charging. 

In some cases, you can also read the battery level on your phone, such as iPhone or Android devices. The level shown is that of the A2 earbuds, not the charging case.

Charging case and earbuds (no cable inserted)


  • One light: 0-25% battery remaining
  • Two lights: 26-50% battery remaining
  • Three lights: 51-75% battery remaining
  • Four lights: 79-100% battery remaining

Charging case (with cable inserted and charging)


  • First light blinking: 0-25% battery charged
  • Second light blinking: 26-50% battery charged
  • Third light blinking: 51-75% battery charged
  • Fourth light blinking: 76-99% battery charged
  • Four lights shining: 100% battery charged

A2 - User guide - Care and cleaning

Cleaning your earphones on a regular basis will ensure the best possible sound performance and prevent them from wearing out sooner than expected. 

Sudio A2 features silicone ear tips with a built-in mesh net, protecting the earbuds from dirt, grime (and the notorious earwax), all while sitting comfortably in your ears. These ear tips can be removed from the earbuds and cleaned with water or a cotton swab. Avoid hot water though, as this can distort the size and shape of the ear tips.


Use only a slightly damp cloth when cleaning the earbuds and/or case. You can also use a fine brush or cotton swab to gently clean inside the case, avoiding damage to the charging connectors (copper pins). While the A2 earbuds and case are splash-proof, subjecting them to high moisture levels could lead to permanent water damage.  

Psst, the Sudio Care Kit is ideal for regular maintenance and includes all the tools you need to keep your Sudio earphones in shape!  

Keep in mind that with time, some discoloration may eventually appear. This is most common if the earbuds or charging case continue to come in contact with dirty surfaces or materials over extended periods of time.

A2 - User guide - Download PDF version
A2 - Features - Active Noise Cancellation

A2 features two audio modes that let you decide what you want to hear - and what you don't want to hear. These two modes are called Active Noise Cancellation (ANC) and Normal (Off) mode.

The Active Noise Cancellation (ANC) mode in A2 reduces outside noise which allows you to fully immerse yourself in your own world.

How to switch between the modes

The earbuds are in Normal (Off) mode by default, where background noise is neither reduced nor amplified. By holding the touch control for 2 seconds on either earbud the modes cycle between Normal and Active Noise Cancellation.

How does Active Noise Cancellation (ANC) work?

The mechanics behind Active Noise Cancellation is in its name. A2 uses Hybrid ANC technology, which is a combination of Feed Forward and Feedback ANC technology. Two microphones are located on the outside and inside of each earbud to effectively capture all kinds of noise, even the noise you hear through your ears while wearing the earbuds. The speakers then emit the recorded noise in real-time - but inverted - which cancels the noise nearly entirely.

A2 - Features - Dual-microphone VividVoice technology

A2 features a dual-microphone VividVoice technology, two beamforming microphones for speech. Come in clearly on the important calls and video meetings. The microphones isolate your voice and filter out the rest, making it easier to be heard over busy cafes, noisy children, or office chaos.

One microphone is directed towards your mouth and the other in the opposite direction. A2 listens to both inputs, compares the delays and works out which noise is desired (your voice) and which one is undesired (the rest). This results in a crisper sound with reduced noise coming from the outside. 

A2 - Features - Water Resistance Rating (IPX4)


Sudio A2 is a device with a level 4 water protection rating, which means that the earbuds are water-resistant. At this level, the earbuds can handle rain, sweat, and the occasional accidental splash.

IPX is an official third-party rating that is awarded through a series of tests. Sudio A2 is also completely sweat-proof and can be used during exercise.

However, for an IPX 4 rating, we would like to communicate that there is no guarantee that the earbuds will remain fully operational after activities like swimming or showering with them.

While the earbuds have IPX4 protection, the charging case is not waterproof. If you touch the charging case with wet hands or put the earbuds into the case while they are not completely dry, the product might be damaged. Please always make sure that earbuds are not wet when you put them back in the charging case. Unfortunately, if the earphones are damaged in these cases, they will not be considered a manufacturing defect and will not be eligible for replacement through our warranty.


A2 - FAQ - Can I use one earbud at a time?


Yes, you can use one A2 earbud on its own for both playback and calls. Both earbuds have the same components (speakers and microphones), which means that you can use either the left or right earbud at your leisure. 

To ensure a stable connection, always keep the unused earbud inside the charging case. 

It’s always a good idea to charge both earbuds until full after having used them separately to maintain the same battery levels.

A2 - FAQ - Does A2 support wireless charging?

No, A2 does not support wireless charging through Q1-technology or similar. Charge your A2 case by inserting a Type-C USB-cable and connecting it to either a USB-port or to a wall socket via an adapter.

We recommend using the Sudio cable included in the product packaging, however other third-party Type-C USB-cables may be compatible too.