Audio T Verdict
The Sennheiser ACCENTUM Open are a refreshingly simple alternative to conventional sealed in-ear headphones. Instead of pushing silicone tips into the ear canal, they use an open-fit design that sits naturally at the ear, allowing you to enjoy music while remaining aware of what is happening around you.
They are particularly well suited to everyday listening, working from home, walking and situations where complete isolation would actually be inconvenient. Add Sennheiser's 11mm dynamic drivers, Bluetooth 5.3, multipoint connectivity, Smart Pause and a lightweight 4.35g-per-earbud design and you have a very easy pair of wireless earbuds to live with.
If you want powerful Active Noise Cancellation for flights or noisy trains, these are not the right Sennheisers. If comfort, simplicity and awareness are higher up your list, the ACCENTUM Open make a lot of sense.
Important: Open-Fit by Design
The ACCENTUM Open do not feature Active Noise Cancellation and are deliberately designed to allow external sound to remain audible. If you want a sealed in-ear design with greater isolation and ANC, consider the Sennheiser ACCENTUM True Wireless instead.
Sennheiser ACCENTUM Open Earbuds
The Sennheiser ACCENTUM Open are true wireless earbuds built around an open-fit design, providing an alternative for listeners who dislike the sealed or plugged-in feeling of conventional in-ear headphones.
Each earbud uses an 11mm dynamic transducer tuned by Sennheiser, while Bluetooth 5.3, multipoint connectivity, touch controls, Smart Pause and dual beamforming microphones make them suitable for music, calls and everyday wireless listening.
The charging case extends total listening time to as much as 28 hours according to Sennheiser's current advertised figure, while IPX4 splash resistance helps make the earbuds suitable for use when you are out and about.
- Open-fit true wireless earbuds
- Sennheiser-tuned 11mm dynamic drivers
- Bluetooth 5.3
- SBC and AAC Bluetooth codecs
- Multipoint connectivity
- Connect to two devices simultaneously
- Smart Pause
- Touch controls
- Dual beamforming microphones
- Independent single-earbud operation
- Up to 28 hours total advertised battery life
- USB-C charging case
- IPX4 splash-resistant earbuds
- Just 4.35g per earbud
- No silicone ear tips required
Open Listening Without Blocking Out the World
The defining feature of the ACCENTUM Open is their open in-concha design.
Instead of sealing the ear canal with silicone or foam tips, the earbuds rest naturally at the ear and allow environmental sound to remain audible alongside your music.
That makes them especially useful when you need to hear:
- Traffic while walking
- Announcements during a journey
- Colleagues in an office
- Family members at home
- Doorbells and alarms
- Other important sounds around you
No Silicone Ear Tips
Many true wireless headphones achieve isolation by inserting a silicone tip into the ear canal and creating an acoustic seal.
The ACCENTUM Open take the opposite approach. There are no ear tips to size, fit, clean or periodically replace.
For listeners who find conventional in-ear headphones uncomfortable during longer sessions, that alone could make them significantly more appealing.
Sennheiser-Tuned 11mm Dynamic Drivers
Each ACCENTUM Open earbud contains an 11mm dynamic transducer.
Sennheiser has tuned the acoustic system to provide a clear and balanced presentation while working within the deliberately open design.
The specified frequency response is 25Hz to 15kHz, with support for both SBC and AAC Bluetooth audio codecs.
Open Fit and Bass Performance
An open earbud behaves differently from an in-ear model that creates a tight seal.
The final bass balance can therefore depend more heavily on the shape of your ears and how securely the earbuds sit in position.
That is a normal characteristic of open-fit earbuds rather than a fault with the product.
Open-Fit or Sealed In-Ear?
Choose an open-fit earbud such as the ACCENTUM Open if comfort and environmental awareness are priorities. Choose a sealed in-ear model if you want stronger passive isolation, more consistent low-frequency coupling or Active Noise Cancellation for particularly noisy environments.
Lightweight Everyday Comfort
Each earbud weighs only 4.35g.
Combined with the absence of an ear-canal seal, that keeps the physical sensation of wearing them relatively light and unobtrusive.
This can be particularly useful if you regularly wear wireless earbuds for several hours across the working day.
Bluetooth 5.3
The ACCENTUM Open use Bluetooth 5.3 for their wireless connection.
They support the common A2DP, AVRCP and HFP Bluetooth profiles together with SBC and AAC audio codecs, making them compatible with a wide range of smartphones, tablets and computers.
Multipoint Connectivity
Multipoint Bluetooth allows the earbuds to remain connected to two compatible devices at the same time.
You could, for example, listen to music from your computer before answering a call arriving on your smartphone without manually disconnecting one device and pairing the other.
Pairing Memory for Up to Eight Devices
The ACCENTUM Open can retain pairing information for up to eight devices.
This is particularly useful if your earbuds are regularly shared between equipment such as:
- Personal smartphone
- Work smartphone
- Laptop
- Tablet
- Desktop computer
- Other compatible Bluetooth sources
Smart Pause
Built-in wearing detection allows playback to pause automatically when an earbud is removed.
It is a small convenience, but one that makes regular interruptions much less fiddly when somebody starts talking to you.
Touch Controls
Playback and call functions can be accessed through the touch-sensitive surfaces on the earbuds rather than continually reaching for your phone.
This keeps everyday operation straightforward whether you are sitting at a desk, walking or travelling.
Use Either Earbud Independently
The left and right earbuds can be used independently.
This gives you the option of wearing a single earbud for calls or casual listening while leaving the other ear completely unobstructed.
Clearer Voice Calls
Each earbud contains two MEMS microphones arranged as a beamforming system.
The microphones work with voice-processing and noise-reduction technology to focus more effectively on your speech during calls.
Because the earbuds themselves remain open, you can also hear your own voice more naturally instead of experiencing the blocked sensation associated with tightly sealed earphones.
Up to 28 Hours Total Listening
Sennheiser currently advertises up to 28 hours of total listening time when the earbuds are used with their charging case.
Actual battery life will vary according to listening level, Bluetooth conditions, calls and general usage.
Compact Charging Case
When you are not listening, the earbuds slot into the supplied charging case.
The case protects them during transport while also replenishing their internal batteries, allowing several listening sessions before the case itself needs to be connected to power.
USB-C Charging
The charging case uses a USB-C connection.
A complete charge takes approximately one hour under Sennheiser's specified conditions.
Quick Charging
If the battery is running low just before you leave home, a short top-up can be enough to get you listening again.
Sennheiser specifies approximately one additional hour of playback from a 10-minute charge.
IPX4 Splash Resistance
The earbuds themselves carry an IPX4 rating.
This means they are designed to resist splashes and moisture encountered during normal everyday use, making them suitable for activities such as walking or light exercise.
IPX4 does not mean waterproof, and the earbuds should not be submerged.
Charging Case Is Not IPX4 Rated
The IPX4 rating applies to the earbuds, not the charging case. Keep the case protected from rain, spills and excessive moisture.
ACCENTUM Open or ACCENTUM True Wireless?
ACCENTUM Open
- Open-fit design
- No silicone ear tips
- Environmental awareness
- 11mm dynamic drivers
- Bluetooth 5.3
- Multipoint connectivity
- No Active Noise Cancellation
- Ideal for everyday open listening
ACCENTUM True Wireless
- Sealed in-ear design
- Silicone ear tips
- Greater passive isolation
- Active Noise Cancellation
- Designed for more immersive listening
- Better suited to noisier environments
- More conventional true wireless fit
- Alternative for frequent travellers
Which Should You Choose?
Neither design is automatically better.
If you frequently listen on aircraft, busy trains or in loud environments, the isolation and Active Noise Cancellation of the ACCENTUM True Wireless are likely to be more useful.
If you dislike sealed earbuds or regularly need to remain aware of your surroundings, the ACCENTUM Open are likely to be the more comfortable and practical option.
Useful for Working From Home
The combination of an open fit, lightweight design, voice microphones and multipoint Bluetooth makes the ACCENTUM Open particularly useful during a working day.
You can listen to music without becoming completely detached from the room and move between computer audio and calls without continually changing headphones.
Useful for Walking
Remaining aware of traffic, bicycles and other people can be useful when listening to music outdoors.
The open design makes the ACCENTUM Open better suited to this type of listening than headphones designed specifically to block as much external sound as possible.
Useful Around the Home
Open earbuds can also make sense when listening around the house.
You can enjoy music or podcasts while still being more likely to hear the doorbell, another person speaking or other sounds that need your attention.
Who Are the Sennheiser ACCENTUM Open For?
- Listeners who dislike sealed in-ear headphones
- People who do not like silicone ear tips
- Listeners wanting greater environmental awareness
- Everyday music listening
- Walking
- Working from home
- Shared office environments
- Voice and video calls
- Listeners regularly switching between two Bluetooth devices
- Anyone wanting particularly lightweight wireless earbuds
- People looking for straightforward wireless operation
Who Are They Not For?
- Listeners wanting Active Noise Cancellation
- Anyone requiring maximum external noise isolation
- People who specifically prefer a sealed in-ear fit
- Frequent flyers wanting strong noise reduction
- Listeners wanting advanced Bluetooth codecs beyond SBC and AAC
- Anyone needing waterproof rather than splash-resistant earbuds
Key Features
- Sennheiser ACCENTUM Open
- True wireless earbuds
- Open in-concha fit
- No silicone ear tips required
- 11mm dynamic transducers
- Sennheiser acoustic tuning
- 25Hz to 15kHz frequency response
- Bluetooth 5.3
- Bluetooth Class 1
- SBC codec support
- AAC codec support
- A2DP profile
- AVRCP profile
- HFP profile
- Multipoint connectivity
- Two simultaneous device connections
- Pairing memory for up to eight devices
- Touch controls
- Smart Pause
- Independent left or right earbud operation
- Two MEMS microphones per earbud
- Beamforming microphone technology
- Noise reduction for voice calls
- Up to 28 hours total advertised playtime
- Approximately one-hour full charging time
- 10-minute quick charge
- USB-C charging case
- IPX4 splash-resistant earbuds
- 4.35g per earbud
- 38g total weight including case and earbuds
- No Active Noise Cancellation
- Black and Cream finishes
Frequently Asked Questions
Are the Sennheiser ACCENTUM Open noise cancelling?
No. The ACCENTUM Open do not feature Active Noise Cancellation. Their open design intentionally allows external sound to remain audible.
Do the ACCENTUM Open go inside the ear canal?
They use an open in-concha fit rather than the silicone ear tips found on conventional sealed in-ear headphones.
Do they use silicone ear tips?
No. There are no silicone tips to fit or change.
Are open earbuds better than normal earbuds?
It depends on how you listen. Open earbuds are useful when comfort and environmental awareness are priorities, while sealed earbuds provide greater isolation from external noise.
Do the ACCENTUM Open have Active Noise Cancellation?
No.
What size drivers do they use?
Each earbud uses an 11mm dynamic transducer.
What Bluetooth version do they use?
Bluetooth 5.3.
Which Bluetooth codecs are supported?
SBC and AAC.
Do they support aptX?
No aptX codec is specified for the ACCENTUM Open.
Do they support multipoint Bluetooth?
Yes. They can remain connected to two compatible devices simultaneously.
How many devices can they remember?
The ACCENTUM Open can retain pairing information for up to eight devices.
Can I use just one earbud?
Yes. Either earbud can be used independently.
Do they automatically pause when removed?
Yes. Smart Pause can automatically stop playback when an earbud is removed.
Do they have touch controls?
Yes.
Can I use them for phone calls?
Yes. Each earbud contains two MEMS microphones using beamforming and noise-reduction processing for voice calls.
How long does the battery last?
Sennheiser currently advertises up to 28 hours of total playtime when the charging case is included. Actual battery life will vary according to use.
How long do they take to charge?
Approximately one hour for a complete charge under the manufacturer's specified conditions.
Do they support quick charging?
Yes. Sennheiser specifies approximately one additional hour of playback from a 10-minute charge.
How do they charge?
The supplied charging case uses USB-C.
Are the ACCENTUM Open waterproof?
No. The earbuds are IPX4 splash resistant rather than waterproof.
Is the charging case waterproof?
No IPX4 rating is specified for the charging case, so it should be kept protected from moisture.
How much does each earbud weigh?
Approximately 4.35g.
Can I use them with an iPhone?
Yes. They use standard Bluetooth connectivity and support AAC.
Can I use them with an Android phone?
Yes. They can be paired with compatible Bluetooth Android smartphones and support SBC and AAC.
Can I use them with a laptop?
Yes, provided the computer supports compatible Bluetooth audio.
Are they good for walking?
The open design can be particularly useful when walking because environmental sound remains more audible than with sealed noise-cancelling earbuds.
Are they suitable for flying?
They will work on a flight when connected to a compatible Bluetooth source, but their open design provides little isolation from aircraft noise. A sealed noise-cancelling headphone would generally be more appropriate if reducing cabin noise is the priority.
What colours are available?
Audio T offers the ACCENTUM Open in Black and Cream.
Related Sennheiser Products and Audio T Guides
Why Buy Sennheiser ACCENTUM Open From Audio T?
Choosing between open-fit and conventional in-ear headphones is largely about how and where you listen. Audio T can help you decide whether the ACCENTUM Open's lightweight, non-sealing design is right for you or whether a more isolating pair of headphones would better suit your everyday listening.
We can also help with Bluetooth compatibility, alternative Sennheiser models and finding the right headphones for music, travel, working from home or general everyday use.
- Friendly headphone advice
- Open-fit and in-ear comparisons
- Sennheiser product guidance
- Bluetooth compatibility advice
- Wireless headphone demonstrations where available
- Advice for music and everyday listening
- Working-from-home headphone advice
- Travel headphone recommendations
- Alternative Sennheiser models
- Ongoing after-sales support
Contact your local Audio T store if you would like help choosing the right Sennheiser headphones or earbuds for the way you listen.