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    Sennheiser CX 400 In-ear Bluetooth Headphones - White

    Sennheiser CX 400 In-ear Bluetooth Headphones - White

    Key Features

    • Totally wireless design means zero tangled cables
    • Bluetooth connectivity with a 7-hour battery life
    • Decades of Sennheiser expertise and craftsmanship
    • Choose between 4 sizes of ear bud for the perfect fit
    • Use the app to adjust the sound to your taste
    Add to compare View Product Specs

    Sennheiser CX 400 In-ear Bluetooth Headphones - White

    Delivery Delivery from Thu 22nd Apr Delivery from tomorrow, 22nd April From tomorrow, 22nd April From tomorrow, Thu 22nd April

    We’re still delivering to our customers safely. Since the latest Government advice, we’ve had to make a few changes. If you’re self-isolating then we’re now only able to deliver products to your doorstep. Otherwise, we’ll come into your home but only deliver to behind your main door. Unfortunately, as our delivery partner is no longer able to operate in Northern Ireland, we are unable to offer home delivery to any Northern Ireland postcode.

    We’ll deliver any product to your home, 7 days a week.

    • We schedule deliveries from 7am until 7pm.
    • You can choose a paid morning or afternoon delivery timeslot when you checkout.
    • Free delivery is also available.
    • We’ll text you a 4 hour timeslot on the morning of your delivery.
    • We'll give you your driver’s number just in case there are any issues.
    • Your driver will call you to keep you up to date on the day.
    • Delivery restrictions apply. Please see our delivery page for more information.

    Free next day delivery with Click and Collect

    You don’t have to wait in to get this item, we can deliver your parcel to a local CollectPlus store.

    • With over 7,000 local stores across the UK, it’s likely there’s one close to your home.
    • You can pick the item up at a time that’s convenient to you.
    • We’ll text you as soon as it’s ready to collect.
    • You’ve then got 10 days to collect your item.
    • Deliveries can be made until 9pm on the day of delivery.
    △ The earliest delivery date may vary based on your postcode.
    AO Finance Flexible credit options available

    Product Overview

    When you’re out and about, your music can come along for the ride with these Sennheiser headphones. They’re completely wireless, so no cables will get in your way when you’re walking around town, while the 7-hour battery life means they’ll still be playing when you walk back through your door. Plus, with 4 different sized ear tips, you can find that perfect fit that’ll help block out annoying sounds. This means you can boogie along to your tunes while you’re decorating the kitchen, without your partner’s TV show butting in every now and then. There’s even a clever app that lets you change up the sound settings to how you like them, which is perfect if you’re switching between streaming a film and then bopping to some R&B. And, whether you’re laughing along to a podcast or singing your heart out to Whitney, Sennheiser’s signature sound will deliver powerful audio that’ll make you shed a tear.

    Key Features

    • Totally wireless design means zero tangled cables
    • Bluetooth connectivity with a 7-hour battery life
    • Decades of Sennheiser expertise and craftsmanship
    • Choose between 4 sizes of ear bud for the perfect fit
    • Use the app to adjust the sound to your taste
    Add to compare View Product Specs

    Features we love

    A front row seat to your dream gig

    These Sennheiser headphones bring you even closer to the music, with studio-quality engineering that’ll blow your mind. Each bud has a specially designed, bespoke audio driver tucked away inside for incredible clarity and a deep, rumbling bass you can really feel. And you can even tailor the experience to your liking with built-in equalisers to get the levels just right. That means when you pop them in, it’ll be like walking around with your very own private concert.

    Premium sound for every device

    Whether you’re jamming to tunes on your phone, or kicking back on the sofa with tablet in hand, these Sennheiser headphones have you covered. They’re made to support a huge range of different devices and codes, including SBC, AAC and aptX. That means however you choose to listen, you’ll always enjoy the same high-quality experience.

    Never run out of power

    These Sennheiser headphones have got plenty of juice to keep you hooked on your favourite playlists all day. The buds themselves have a 7-hour battery life that’ll have you grooving for ages, while the compact case can hold a further 20 hours of charge if you need a top-up. So if you find yourself running low when you’re out and about, they’ll be ready for action again in no time.

    A comfy fit for endless listening

    Lose yourself in the music with the comfort and style of these Sennheiser headphones. They’re specially made to sit snugly in your ear thanks to an ergonomic design, letting you enjoy playlist after playlist without becoming a nuisance. That means you can sit back with good audiobook for hours on end, or enjoy loads of tunes all day long.

    Stay in control

    Pair up your new Sennheiser headphones to any compatible device with the Smart Control app. As well as a quick and easy wireless connection, it also lets you customise just about everything from the bass to how much outside noise you want to hear, which is great when you need to listen for traffic. So, you can pump up the jams at home, or cross the road in complete safety while you’re out.

    Decades of expertise

    Sennheiser have a long history of professional, high-quality engineering and craftsmanship to draw from. For over 75 years, they’ve pioneered some of the most outstanding sound technology designed to give music fans an incredible experience, with crystal-clear highs and deep, rumbling bass. That means you can get fully immersed in your favourite tracks, hear every single note, and really feel the rhythm.

    Product Specification

    Key Information

    (H)20.0 x (W)15.0 x (D)10.0
    Headphone Type
    Microphone Type
    Built-in microphone
    Recommended Usage


    USB Input

    Dimensions Including Packaging

    Depth Including Packaging
    17 cm
    Height Including Packaging
    5 cm
    Width Including Packaging
    12 cm


    3.5mm Jack

    Product Detail

    Country Of Origin
    (H)20.0 x (W)15.0 x (D)10.0
    CX 400
    Weight With Packaging
    0.202 Kg

    Sound Technology

    Driver Unit


    Manufacturer Warranty
    1 Year

    Wireless Connections

    Bluetooth Version

    Customer Reviews

    5 / 5
    Showing 1 of 1 review

    One of the best!!

    Very nice item. I'm picky about sound but the quality is very good. Just need to download the sennheiser app to personalise the sound and add some extra Bass! You can't get anything better for the price

    Any offers are genuine savings. We always want to be able to offer you an incredible deal, so we’ll always match our competitors on price. This means our prices could drop further, or potentially reduce again once a promotional event ends. If our price drops, or you do find what you’re looking for cheaper elsewhere, we’ll offer our price match promise. See terms and conditions.

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