Experience advanced wireless audio and step into tomorrow with MOMENTUM True Wireless 4, our latest generation of earbuds. Immerse yourself in sound that’s tuned to your hearing and preferences. Discover future-proof features like Auracast™ and LE Audio* with adaptive ANC and up to 30 hours of playtime*.
Sennheiser Signature Sound
MOMENTUM True Wireless 4 delivers exceptional sound fidelity, ensuring every detail and emotion is heard just as the artist intended, thanks to our TrueResponse transducer system. Enjoy high-end sound with impactful bass and refined treble response.
Adaptive Noise Cancellation (ANC)
Our adaptive ANC technology automatically adjusts noise cancellation to your surroundings, providing an immersive listening experience wherever you are.
Future-Proof Technologies
Step into the future with Auracast™ support and LE Audio*, and enjoy the latest codecs with Bluetooth® 5.4 compatibility. These features ensure that your listening experience remains cutting-edge.
All-Day Comfort
Assorted sizes of soft silicon ear tips and fins ensure a comfortable fit for extended listening sessions, making all-day wear effortless and enjoyable.
Sound Personalization
Customize your sound with guided tests for personalized sound profiles, an adaptive 5-band EQ, Sound Zones, Sound Check, or pre-set modes, all available through the Sennheiser Smart Control app.
Extended Battery Life
Enjoy up to 30 hours of playtime with our new battery system and fast Qi wireless charging. Just 8 minutes of charging provides 1 hour of playback, ensuring your earbuds are always ready when you are.
Lossless Audio
Guarantee flawless bit-by-bit transmission of audio, maintaining uncompromised sound quality during wireless listening with up to 24bit/96kHz audio resolution.
Master of Sound
No matter where you are, discover a world of exceptional sound with the highest quality audio sources. Experience music the way the artist intended with the outstanding fidelity of Sennheiser’s TrueResponse transducer system.
Freedom from Noise and Distractions
MOMENTUM True Wireless 4 automatically adjusts noise cancellation to your surroundings, ensuring nothing stands between you and your music. The low-noise, natural-sounding Transparency Mode allows you to stay aware of your surroundings at a touch.
The Future of Listening
Experience the wireless audio of tomorrow with future-proof technology such as Auracast™* and LE Audio*. These features revolutionize the way we share and stream audio.
Designed for All-Day Comfort
The ergonomic design and soft silicon ear tips of MOMENTUM True Wireless 4 provide a secure fit that feels great even over long listening sessions. Enjoy up to 30 hours of listening pleasure with our high-quality battery system and quick charging feature.
Smart Connectivity
MOMENTUM True Wireless 4 makes every moment of listening, every conversation, and every interaction rewarding. Automatically connect your devices as soon as you take them out of the case, control via a customizable touch interface, and charge wirelessly with Qi charging. Seamlessly switch between two connected devices with multipoint connectivity.
Naturally Effortless Communication
The high-quality 6-mic system ensures you can be heard perfectly during calls, even in noisy environments. Call virtualization simulates the feeling of face-to-face conversations, reducing fatigue.
Timeless Design and Sennheiser Quality
MOMENTUM True Wireless 4 matches progressive features with timeless, finely crafted design and Sennheiser quality. Available in Black Graphite, White Silver, and Black Copper, their minimalist aesthetic is elevated by premium materials such as textile and metallic finishes.
Smart Control App
Download the Sennheiser Smart Control app to customize your sound using Sound Personalization, the 5-band built-in EQ, sound modes, and Sound Zones, and enjoy the full experience MOMENTUM True Wireless 4 has to offer.
Wearing style: True wireless stereo earphones
Ear Coupling: Ear canal
Connectivity: Bluetooth 5.4 compliant, class 1, 10 mW (max); Bluetooth Classic and Bluetooth LE Audio supported
Transmission frequency / modulation: 2,402 MHz to 2,480 MHz; GFSK, π/4 DQPSK / 8DPSK
Mic pick-up pattern: 3 mics per earbud, beamforming for noise reduction
Battery lifespan: Up to 7.5 hrs music playtime with earbuds (ANC off); Up to 7.0 hrs music playtime with earbuds (ANC on) Up to 30 hrs overall music playtime with charging case (test condition: iPhone, mid volume level 85 dB)
Power Supply: 5 V⎓, 1000 mA max; USB charging via USB-C socket at charging case; Qi Wireless charging
Magnetic strength field: Earbuds: 0.95 mT, charging case: 105 mT
Weather resistance: IP54, dust and splash resistant (earbuds only)
Product Specification: 72.4 g (both earbuds and charging case) 6.2 g (single earbud) 66.4 g (charging case) 70,1 x 44,6 x 34.8 mm (earbuds and charging case)
Operating condition: Operating temp: 0 to +40°C; Charging temp: 5 to 35°C Rel. humidity 25 to 75%, non-condensing
Storage condition: Temp: –20 to +60°C; Rel. humidity 10 to 90%
App support: Sennheiser Smart Control app for iOS™ and Android™
In The Box
Sennheiser MOMENTUM True Wireless 4 Noise-Canceling Earbuds (Black Copper)
Wireless Charging Case
USB-C Charging Cable
Silicone Ear Adapter Sets (XS, S, M, L)
Silicone Ear Fin Sets (S, M, L)
Limited 2-Year Manufacturer Warranty
Warranty Period: 2 Year from the date of Invoice
Covered: Manufacturing Defects Only
Website: https://en-in.sennheiser.com/service-support-contact-service-centers-in-india
Contact No: 1800 22 36 32
Email Id: in-info@sennheiser.com
Sennheiser is a well-known brand in the audio industry. They offer a wide range of products catering to both audiophiles and casual listeners. Their products include open back and closed back audiophile headphones, in-ear monitors, ANC headphones, and true wireless earbuds. They are known for their exceptional sound quality and durability. Whether you're a professional musician or just a music enthusiast, Sennheiser has something for everyone.
It is the best and clean sounding IEM, perfect for the Beginner.
I love the fact that I can change the nozzle and its a little different sounding, so its two in one.
The cable quality is out of the world no external sound when I touch it.
I can hear so many details clearly. I say please go for this, it is perfect first IEM and the Perfect Upgrade if you had IEM under 2k before
KEFINE Klean IEM
09/04/2025
Saket Choudhary
Value for money
It provides Awesome sound quality go and buy it m
AUDIOCULAR SPARK Hi-Res Portable DAC Dongle CX31993 + MAX Amp - Black
09/02/2025
Abhishek Chaturvedi
Must Buy IEM 👌🏼👍🏼
🎧 KZ Castor Pro IEM – Review
🔊 Sound Quality
The KZ Castor Pro delivers clear and detailed sound with excellent separation across lows, mids, and highs. The decent thumping bass is tight and controlled, giving energy to tracks without overwhelming the vocals or instruments. Its super-balanced tuning ensures a natural, enjoyable listening experience suitable for all genres.
🎚 Unique DIP Switch Equalizer
What sets the Castor Pro apart is its DIP switch physical equalizer. With up to 16 different tuning options, it allows listeners to adjust the sound profile on the go—boosting bass, enhancing treble, or keeping it neutral. This feature gives it a level of flexibility rarely seen in IEMs at this price point.
🔇 Noise Isolation
Although it lacks active noise cancellation, the design offers an excellent passive seal. The snug fit ensures that outside noise is effectively blocked, making the listening experience immersive and ensuring ANC doesn’t feel like a missing feature.
🎼 Hi-Res & DAC Performance
For those using Hi-Res lossless audio, pairing the Castor Pro with a DAC is highly recommended. The extra power and clarity from a DAC enhance the already impressive soundstage, detail retrieval, and overall dynamics, making the listening experience truly premium.
💰 Value for Money
At its smart price, the KZ Castor Pro punches well above its weight. It combines detailed sound, punchy bass, balanced tuning, and innovative features—making it a strong choice for both audiophiles on a budget and everyday music lovers.
KZ Castor Pro IEM With Mic
09/02/2025
Sarthak Chandra
Very good experience until it lasted
Have been using these buds for like an year now, they gave me a great time all that while, only recently the cable started getting green and there was an issue with audio drop on even a slight movement (like every earphone ever), but still a great investment for an year.
KZ Acoustics EDX Pro Wired IEM With Mic
09/02/2025
Fahim Imam
Got this as my first iem from audio store
Got this as my first iem from audio store.. much much more worth than the price.. the bass!!.. my gawddd, it's something which is gonna surprise you.. I got it paired with the moondrop echo a dac.. and trust me, couldn't have asked for anything better.. and the delivery was done to me in kolkata, just within a day.. remarkable job audio store!♥️
KEFINE Quatio IEM
09/01/2025
K.F.
Extremely Surprised
Loved the new gear they sound absolutely phenomenal and mind if say the looks and aesthetic of the KZ Castor Pro is underrated for its price, as a newbie I was a little hesitant to jump in this rabbit hole, but it was worth it. Shoutout to The Audio Store to build up my courage, they were very helpful as I was placing my order I fumbled and they responded very positively and helped me correct my mistake. Thank You
KZ Castor Pro IEM With Mic
08/31/2025
Anonymous
Excellent performance with ANC good mic this
Excellent performance with ANC good mic this song is like heaven
KZ Castor Pro IEM With Mic
08/31/2025
Akshay Ramani
Great IEM in a segment and the market
Perfect for beginners to start their audiofile journey
I'm satisfied and convinced of this product
The packaging
The quality
And The performance
Trust he go for this one if you never try this one
Just give it a try you will not regret it
I have manny IEM's I'm my collection
But this one is really fantastic
Thanks to The Audio Store
They have many discount in compar to others in market
And shippment is on the time no worrys
1999 is nothing the engineering is perfect of this IEM,,,
AUDIOCULAR X KZ Castor Pro X Type-C IEM With Mic
08/29/2025
Elex Edward Khedia
Amazing product
Amzing product
KZ Acoustics ZS10 Pro 2 IEM With Mic
08/28/2025
Anonymous
Love the way it sounds rich in every range
Love the way it sounds rich in every range perfect for beginners but if you're not a bass head go for non bass varient.
KZ Castor Pro IEM With Mic
08/26/2025
Kaustubh M
Loving it
This is my first ever IEM that I purchased after research of couple of months. And I can say that this was a good decision on my end. Cable is good. Buds look stylish. Comes with a small carry pouch and 6 pairs of ear tips. Sound quality is awesome. Love the instrument separation. Customisable EQ gives them versatility. You can actually experience how other IEM sound just be playing around with the EQ.
TANCHJIM Bunny Type-C DSP Plug with Mic IEM
08/26/2025
Dheeraj Reddy
Amazing Product, Don't Miss!
Actually, l'm new to this IEM world. Such an amazing product. If you are new to iem just as me, I would highly recommend his product to try out. The OG. There are 16 types of tuning options to play around and explore your favourite music in a new way and the build quality is also pretty good. Overall a nice product 👍.
KZ Acoustics Castor IEM With Mic
08/25/2025
Richard
Good
Good sound
MOONDROP CHU II DSP Type-C IEM
08/24/2025
Koushik Roy
Excellent sound Quality
5/5 Mids and Highs
5/5 Well balanced Bass, doesn't overpower the music
5/5 Design look premium and classy
They are quiet heavy and huge
KZ Castor Pro IEM With Mic
08/24/2025
Anonymous
Its my first time buying an iem and it sounds sooo good the design is good the wire can be improve
Its my first time buying an iem and it sounds sooo good the design is good the wire can be improve, the bass is somewhat missing and the app has some glitches regarding equalizer. Otherwise this iem is better than my tws. I really like it.
TANCHJIM Bunny Type-C DSP Plug with Mic IEM
08/23/2025
STAY TUNED ON EVERY PLATFORM
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100% Original products with brand warranty
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Ships in 24 Hours*
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Meet
It is the best and clean sounding IEM
It is the best and clean sounding IEM, perfect for the Beginner.
I love the fact that I can change the nozzle and its a little different sounding, so its two in one.
The cable quality is out of the world no external sound when I touch it.
I can hear so many details clearly. I say please go for this, it is perfect first IEM and the Perfect Upgrade if you had IEM under 2k before
KEFINE Klean IEM
Saket Choudhary
Value for money
It provides Awesome sound quality go and buy it m
AUDIOCULAR SPARK Hi-Res Portable DAC Dongle CX31993 + MAX Amp - Black
Abhishek Chaturvedi
Must Buy IEM 👌🏼👍🏼
🎧 KZ Castor Pro IEM – Review
🔊 Sound Quality
The KZ Castor Pro delivers clear and detailed sound with excellent separation across lows, mids, and highs. The decent thumping bass is tight and controlled, giving energy to tracks without overwhelming the vocals or instruments. Its super-balanced tuning ensures a natural, enjoyable listening experience suitable for all genres.
🎚 Unique DIP Switch Equalizer
What sets the Castor Pro apart is its DIP switch physical equalizer. With up to 16 different tuning options, it allows listeners to adjust the sound profile on the go—boosting bass, enhancing treble, or keeping it neutral. This feature gives it a level of flexibility rarely seen in IEMs at this price point.
🔇 Noise Isolation
Although it lacks active noise cancellation, the design offers an excellent passive seal. The snug fit ensures that outside noise is effectively blocked, making the listening experience immersive and ensuring ANC doesn’t feel like a missing feature.
🎼 Hi-Res & DAC Performance
For those using Hi-Res lossless audio, pairing the Castor Pro with a DAC is highly recommended. The extra power and clarity from a DAC enhance the already impressive soundstage, detail retrieval, and overall dynamics, making the listening experience truly premium.
💰 Value for Money
At its smart price, the KZ Castor Pro punches well above its weight. It combines detailed sound, punchy bass, balanced tuning, and innovative features—making it a strong choice for both audiophiles on a budget and everyday music lovers.
KZ Castor Pro IEM With Mic
Vaibhav Pancholi
This DAC is performing quite well
This DAC is performing quite well. No heating or white noise issues for me. I am using it with EDC Pro and Castor Pro Harman Target and noticing a good significant upgrade in overall frequency range. I am loving this DAC so far. Build quality is also good at this price range, let's see how long it lasts.
AUDIOCULAR SPARK Hi-Res Portable DAC Dongle CX31993 + MAX Amp
Sujal
Amazing Service
I ordered my first pair of IEM's through The Audio Store and the service was great. Got my package within 5 days and had some questions and their customer care is really active and I got all my queries solved. Great experience overall and I have already recommended Audio Store to my friends.
The Audio Store
TK
Kick A** Desktop Amp + DAC
Went thorough tons of online reviews for a purchase of Desktop DAC+AMP. FOSI K7 was kickstarter but reviews about it was fantastic.
Grabbed it without Blinking twice from TAS. As usual it was a next day delivery.
Fosi delivers crystal clear sound both on Headphones and IEM . Driving power of it crazy.
Fosi Audio K7 Desktop DAC & Headphone Amplifier
Chitransh Goher
Excellent Sound Quality
No doubt it reached my expectations ! The sound quality is really good and gaming experience is also good ! If convenience doesn't matter and sound quality is your priority, you can choose this, it's all rounder IEMs !
KZ Castor Pro IEM With Mic
Suryanarayanamurty
EarAcoustic STA-Hi End Series IEM
Excellent sound
EarAcoustic STA-Hi End Series IEM
Sarthak Chandra
Very good experience until it lasted
Have been using these buds for like an year now, they gave me a great time all that while, only recently the cable started getting green and there was an issue with audio drop on even a slight movement (like every earphone ever), but still a great investment for an year.
KZ Acoustics EDX Pro Wired IEM With Mic
Zartab
Awesome
Its geat, the build quality is nice, the wire is preety hard.And quality is sick
AUDIOCULAR SPARK Hi-Res Portable DAC Dongle CX31993 + MAX Amp - Black