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  • Sennheiser MX W1 In-Ear Totally Wireless Headphone with Digital High-Fidelity Stereo Sound (Discontinued by Manufacturer)
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Sennheiser MX W1 In-Ear Totally Wireless Headphone with Digital High-Fidelity Stereo Sound (Discontinued by Manufacturer)


Currently unavailable.
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  • True lossless, digital wireless high-fidelity stereo sound
  • No setup required, simply plug the transmitter to your personal audio/video player, put on the earphones and turn it on
  • Twist-to-fit system for a secure, stable fit without compromising bass or comfort
  • Carrying case with quick-charge functionality enables up to three full recharges to receivers while on the move
  • Compatible with all MP3, DVD, CD players and iPod


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  • Amazon Free 30-Day Tech Support: This item is eligible for free tech support for 30 days from the date of delivery. Over the phone, our trained technicians can help you set up, configure, connect, and troubleshoot so you can start enjoying your new purchase. Owners of qualifying products can reach Tech Support by calling 1-800-362-5703. Learn more


Technical Details

  • Dynamic speaker systems with powerful neodymium magnets deliver clear and detailed audio reproduction
  • "Twist-to-fit" system provides stability and comfort in any ear
  • Carrying case with "Quick-Charge" functionality enables up to three recharges while "on the move"!

Product Details

  • Product Dimensions: 1 x 1 x 3 inches ; 0.2 ounces
  • Shipping Weight: 2 pounds
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B0012XDEI4
  • Item model number: MX W1
  • Average Customer Review: 3.3 out of 5 stars  See all reviews (27 customer reviews)
  • Date first available at Amazon.com: April 18, 2005

Product Description

The Sennheiser MX W1 delivers the ultimate in listening freedom and detailed stereo sound. It communicates uncompressed audio over a robust digital link enabling you to enjoy your music without the hassle of cords. It utilizes "Kleer Technologies" uncompressed digital wireless transmission of high-fidelity sound directly to the "twist to Fit" earphones. The entire system consists of two earphones (left and right), a small transmitter that connects to the MP3 player or other portable device, and a carrying case with built-in quick charge function that enables up to three full recharges while on the go.

Customer Questions & Answers

Customer Reviews

3.3 out of 5 stars
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See all 27 customer reviews
Less than month ,Battery was getting die about 2 hour.... I sent unit to Sennheiser Canada to check my unit.
N. Sasaki
These earphones do stay in my ears - and I can even walk and move about - as long as I don't "bump" them or else they will just fall out.
G. Mason
Others may want to think long and hard about how well this expensive device will meet their needs and expectations.
Retired Ski Bum

Most Helpful Customer Reviews

31 of 31 people found the following review helpful By Ryan Mckenney on July 2, 2008
Verified Purchase
These headphones sound fantastic! They produce a well balanced sound across a wide frequency. Bass, mid range and treble all sound excellent. I haven't heard any distortion. Kleer definitely produces a crisp, clear sound and the headphones allow you to hear an incredible level of detail. I would have thought these were wired if I tested these blindfolded. Operation is simple. Activate the headphones, then activate the transmitter and you have sound!

There's quite a bit of innovation in one package. The transmitter is very small. About half the size of a gum package. It comes with a rubber band to strap it to a MP3 player. If you are in a clear space, you can walk quite a distance away from the transmitter. I was able to get 40 feet away without the audio cutting out. If you walk around walls or corners, it may cut out but if you are directly across, above or below the transmitter, through a wall, it comes in perfectly clear.

Twist to fit works fairly nice and the headphones feel comfortable. You may have problems jostling them loose if you have any jarring movements like running, but seems to handle walking on a treadmill quite well.

The transmitter can last for 10 hours on a single charge, the manual says the headphones last for 3 hours but I have had them run for up to 5 hours. You can charge the headphones in the charging dock three times while on the go but charging the headphones alone can take around several hours, plus or minus, depending on how run down they are. Battery life and charge time is the only true downside aside from the early adopter price.

Pros: Sound amazing, remote charging, comfortable.
Cons: Battery life, cost.
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29 of 30 people found the following review helpful By G. Mason on July 21, 2008
I have been looking for wireless ear buds for a very long time and I immediately purchased the Sennheiser MX W1 as soon as I found it, justifying that the price of convenience was worth the cost. When I received it I could have sworn the ray of light shone right on the box! Could this be the answer to my prayer? Anxiously, I opened the box and knew immediately that this was high quality stuff. I immediately charged it and after long awaited hours, it finally charged. These are my findings:

SOUND - No doubt about it, the sound is chrystal clear.

NO WIRES BABY! - The hassle of tangled wires and wires catching on something is now only a nightmare!

EQUIPMENT:
TRANSMITTER - very light in weight and surprisingly small. You can go about 15 to 30 feet without losing signal (depending on walls, corners, etc.).
EARPHONES - very light weight, sleek in design. However, they're not made for small ears. I am 5'1" woman and petite in size so everything about me is small. These earphones do stay in my ears - and I can even walk and move about - as long as I don't "bump" them or else they will just fall out. In other words, the ear buds are too big to "lock" in place in my small ears. I have to fuss with them to make sure they somewhat stay in place. If the ear buds were just a little smaller it would be perfect for me. Not recommended for small ears - especially children!

BATTERY AND TRANSMITION - At first the transmitter didn't want to come on but after poking around the DC inlet with the charger then it finally came on. Then I had some trouble having the earphones communicate with the transmitter. But eventually they found each other and haven't had problem since.
Read more ›
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20 of 21 people found the following review helpful By budwzr on February 28, 2009
Verified Purchase
I was disappointed in my earbuds at first, because I couldn't get a good fit, and I discovered that the manual is totally inadequate in this regard.

The "secret" for me was to twist the buds backwards (instead of forward) and "catch" the rim of the "bowl" of my ear. The fit is now snug and secure, I can even use the toilet standing up without fear of them dropping in, hahaha.

The other issue I had was I thought I had a pairing problem because the left bud would "cut out" in about 15 minutes. I tried all the re-pairing techniques, and no joy.

What I discovered is that the left battery was no good. It wouldn't hold a charge, and I noticed it stayed lit in the cradle after the other bud charged and its light went out.

I contacted "Eric" at Sennheiser USA, and he immediately sent me a replacement battery by first class mail. Didn't have to register and go through all the normal RMA hassles like other companies.

The customer service experience was personal, and felt like I had my own concierge at Sennheiser.

5 thumbs up to Eric at Sennheiser USA!

As far as sound quality goes, GiGo applies here. f you "groom" your mp3's with "MP3 Gain" (free), to set the playback gain tag to the area of 91db, the MX's will leap into crystal clear optimum sound quality mode.

For you audiophiles out there (like me), playback gain adjuustment DOES NOT introduce clipping when applied properly, and will eliminate clipping as well.

Many of the Amazon MP3's are clipping already because they know that many portable devices, like iPod, have low level audio output, and that most customers would rather have max volume even with some clipping.

MP3 Gain will fix this, and you will be much happier with your SennBuds. Anyone that needs help with this can e-mail me, and I can go into more detail.
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