B2 - User Guide - First-time setup

Congratulations on receiving your new B2! Use this guide to learn about pairing B2 with your preferred device, charging the battery, and restoring the headset to its factory settings. 

What's included in the box

  • B2 headset
  • USB-C charger
  • Owners manual
  • Warnings Manual

Turning B2 on or off

You can use the plus (+) button to power the headset on or off. Do this by holding the button control for 2 seconds until you hear the audio feedback 🔈 On.

Similarly, hold the right button control for 2 seconds until you hear the audio feedback 🔈 Off.

Pairing with a device

Jump to complete guide

Hold the plus (+) button control for 2 seconds until you hear the audio feedback 🔈 On. Open the Bluetooth settings on your device and wait for B2 and the device to locate each other, then select Sudio B2 when it appears in the list. You will hear 🔈 Connected, confirming that the devices are paired with each other!

Charging the battery

Jump to complete guide

There is one battery in total on B2.

The B2 headset is charged with a USB-C charger. When the headset is charging, you will see a light on the side of the headset. 

Restoring B2 to its factory settings

Jump to complete guide

If B2 is behaving unexpectedly or you simply wish to restore it to its original settings, turn the headset off and reset it by pressing the plus (+) button on the headset for 5 seconds. You will hear 2 clicks, that means the reset is complete. 

You may then proceed with pairing B2 again.

B2 - User guide - Connectivity & Pairing

B2 enters pairing mode after turning on the headset, to do that press the plus (+) button on the headset for 2 seconds. When pairing B2 for the first time, you hear 🔈On followed by 🔈Ready to pair, find your Sudio product in the Bluetooth list of your device.

Pairing B2 with a device

  1. Turn on the headset by pressing on the plus (+) button for 2 seconds. 
  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 B2 in the Bluetooth list on your device.
  4. When paired you will hear the audio feedback 🔈Connected.

If B2 has previously been paired with your preferred device, simply turn on the headset and it will automatically connect, so long as Bluetooth is activated on the device and B2 has not been paired with a different device more recently. 

Device compatibility

B2 uses Bluetooth version 5.3 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 B2 and connected device outdoors to see if the interference clears.

B2 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

B2 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 B2 in the Bluetooth list which pairs it with that device instead. However, some devices require B2 to be disconnected from the previous device entirely before they can be paired. It’s not possible to keep B2 connected to several devices at the same time, such as a laptop and smartphone simultaneously.

B2 - User guide - Button controls

B2 has three control buttons that allow you to control certain features on your paired device.

Music/video playback

  • Press once on the round right button to play or pause
  • Press twice on the minus (-) button to rewind
  • Press twice on the plus (+) button to go forward
  • Press once on the minus (-) button to decrease volume
  • Press once on the plus (+) button to increase volume

Incoming phone calls

  • Press once on the round right button to accept a phone call
  • Press (hold) for two seconds on the round right button to reject or end a phone call*

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


  • Press (hold) for two seconds on the plus (+) button to power on the headset. 
  • Press (hold) for two seconds on the plus (+) button to power off the headset. After two seconds the listening mode will change, followed by 🔈 Off.

B2 - User guide - Factory reset

If B2 starts behaving unexpectedly, or if you wish to remove the connection between B2 and the connected device, you can perform a factory reset to restore your Sudio B2 to its original settings. This will reset the connection between your paired devices.

  1. Turn the B2 off by pressing on the plus (+) button for 2 seconds until you hear "Off". 
  2. Press and hold the plus (+) button on the headset for 5 seconds until you hear 2 clicks.
  3. The factory reset is now complete.

You can then proceed to pair the headset with your Bluetooth device.

B2 - User guide - Battery level and management

B2 has one built-in battery on the headset.

Charging and play times

The headset can be used for approximately 12 hours on one charge.

The battery takes approximately 90 minutes to fully charge. 

Charging methods

The B2 headset can be charged with the included USB-C cable.

Battery level indicators

There is one LED-light that indicates the headset's remaining level on the side of the headset next to the charging port. 

When attaching the USB-C cable to the headset, a light will turn on the headset, indicating that the headset is currently charging. 

Headset (with cable attached and charging)

  • White (fixed): 100% battery charged
  • Orange/White blinking: 0-99% battery charged

B2 - User guide - Care and cleaning

Cleaning your headset on a regular basis will ensure the best possible sound performance and prevent it from wearing out sooner than expected. Use only a slightly damp cloth when cleaning the headset. 

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

B2 - User guide - Download PDF version
B2 - Features - Bone Conduction Technology

Bone conduction is the conduction of sound to the inner ear primarily through the bones of the skull, allowing the user to perceive audio content without blocking the ear canal. Bone conduction transmission occurs constantly as sound waves vibrate the bone, specifically the bones in the skull, although it is hard for the average individual to distinguish sound being conveyed through the bone as opposed to the sound being conveyed through the air via the ear canal. 

Although most sounds are transmitted through the air to our ears, bone-conduction headphones rely on sound being transmitted through vibrations on the bones of the head and jaw. The sound from this headset bypasses the eardrum and relays sound directly to the inner ear.

B2 - Features - Water Resistance Rating (IPX5)

Sudio B2 is a device with a level 5 water protection rating, which means that the headset is water-resistant. At this level, the headset can handle heavy rain, sweat, and the occasional accidental splash.

IPX is an official third-party rating that is awarded through a series of tests. Sudio B2 is also completely sweat-proof and can be used during exercise.

However, for an IPX 5 rating, we would like to communicate that there is no guarantee that the headset will remain fully operational after activities like swimming or showering with them.