The Intenso O400HA headphones (blue, Bluetooth 5.3, ringing, ANC) are designed for a generation that expects a pure, interference-free sound experience and does not want to be limited by cables or ambient noise in everyday activities. With advanced Active Noise Cancellation (ANC) technology and a modern design in blue, they thoughtfully follow the user's desires for freedom, style and comfort.

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For those seeking wireless freedom and a desire for exceptional sound clarity, the O400HA is more than just headphones – it’s your ticket to a truly personal sound experience. These headphones are ideal for listening to music on the go, working focused in noisy environments, or having relaxed conversations via the built-in microphone.

They boast a battery life of up to 60 hours, meaning several days of listening without the need to charge. The built-in Bluetooth 5.3 technology enables an extremely stable, fast and energy-efficient connection to your device. This simplifies use at any time, as there is no frustration with interruptions or delays in the sound.

Active Noise Cancellation (ANC) isolates you from external distractions so you can focus on the sound – no matter where you are. Touch controls are natural and intuitive, allowing you to quickly switch between playing, pausing or answering calls without searching for buttons. The sound quality and microphone will not leave you indifferent, whether you are making calls or listening to your favorite playlist.

The blue color with a modern design will appeal to those who want to stand out from the crowd, while the material and fit ensure that the headphones are comfortable for hours on end. The perfect choice for anyone who wants more from every moment - whether for work or play.

Same summary

The Intenso O400HA headphones are suitable for users looking for a wireless solution for everyday music listening and taking calls on the go or in the office. Thanks to the on-ear design and active noise cancellation (ANC) function, they can reduce distracting sounds from the environment, but they may be slightly less comfortable than larger over-ear headphones for longer listening in very noisy rooms or on long flights. The Bluetooth 5.3 standard allows for quick connection and stable use with various devices. A special feature of this model is the ability to ring, which makes it easier to manage calls without constantly reaching for the phone.

Recommendation source: Enaa guides and team experiences.

User view

Typical users of these headphones appreciate the simplicity, comfort and freedom of being cord-free, especially when listening to music, podcasts or taking calls on the go, on public transport or in an open office. With the combination of ANC and a compact on-ear design, they will benefit those who want a private footprint even in a more lively environment, but do not want larger and heavier models.

For more guidance on choosing the right type of headphones, you can read our headphone selection guide . Users often trust the Intenso brand primarily because of its diverse offering and focus on the user experience in everyday use.

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Answers to frequently asked questions

Are the Intenso O400HA headphones suitable for working in an open office?

Yes, the combination of active noise cancellation and the ability to take calls allows for effective use in an open work environment, although in very loud situations the passive isolation is not as high as in larger models.

Do the Intenso O400HA headphones perform well during sports activities?

The headphones are light and compact enough for normal daily commutes or shorter activities, but for more intense running or workouts with a lot of movement, there are even more resistant models with an emphasis on stability and sweat protection.

What connectivity modules are supported and does wireless work with all phones?

The headphones use Bluetooth 5.3, which is compatible with most modern mobile phones, tablets, and computers, so the connection usually poses no problems.

How effective is the ANC on the O400HA; does it completely silence the surroundings?

The active noise cancellation feature successfully reduces constant noise (e.g. traffic, air conditioners), but with sudden or human voices, only partial attenuation should be expected, which is common with on-ear designs.

Where can you learn more about the suitability of different types of headphones?

If you're wondering which type of headphones would best suit your usage pattern, check out our comprehensive guide to choosing headphones .

Description updated: April 2026