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KOSS Black KEB40 3.5mm Connector Canal In-Ear Headphone

  • Noise isolating in-ear headphones
  • Compact, micro in-ear headphones with isolation rings
  • Various size silicone cushions offer perfect fit and custom comfort
  • Unique cord slider removes excess slack a
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Learn more about the Koss KEB40



General SPEC

Driver Unit
Ear Coupling


Noise isolating in-ear headphones

Isolation rings deliver lasting comfort and deep, isolated bass

Dynamic, ultra-efficient 9 mm drivers deliver the Koss sound

An aluminum capsule lends durability to custom comfort

Three different sizes of silicone cushions ensure a perfect fit

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Koss KEB40

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  • Sheldon O.
  • 5/1/2014 4:25:38 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsGarbage

Pros: - Got them on sale for $5

Cons: - not very loud
- metal bands electrocute my ears (static electricity?)
- left side bud stopped working within 6 months of purchase

Other Thoughts: Never experienced pain from ear buds. If you're looking for a shock and only one channel, these are the headphones for you. Not even worth $5. Move along.

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  • robert b.
  • 3/4/2014 2:22:57 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat sound compared to laptop built in speakers

Pros: These are really good compared to what my laptop has built in. The sound is much clearer, more detailed. More comfortable than my old ear buds. I'm a fan! They sound much louder than when using the built in pc speakers so I suggest lowering the volume before insertion.

Cons: Wish they had a built in mic and volume controls.

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  • Ray B.
  • 2/26/2014 3:37:36 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

3 out of 5 eggsDecent, but unstable design

Pros: Sound is pretty good, the rubber cushions fit my ears pretty tightly, offering a good sound. Great bass, with pretty good mids and highs.

Cons: As you can see, the wire is run right into the bud through a wee rubber collar. This results in either digging the bud out of your ear, or just pulling on the wire to get it to fall out.

Regardless of which tack you take though, the connection to the innards of the bud is prone to failure, giving you that sweet, sweet one side of the head sound feeling.

Other Thoughts: Worth a shot if the price is right, but you might want to pick up two or three pairs on discount if they're going to fail after 3 months.

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  • Clint W.
  • 2/25/2014 11:06:45 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggs

Pros: First of all the price at $4.00 with free shipping.They sound great and come with extra,different size ear cone's.What's not to like.

Cons: None that I have.

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  • John H.
  • 2/21/2014 1:37:29 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsSound good but only when properly in your ear

Pros: Inexpensive, durable and comes with 3 sizes of earpads so you get a better than average chance of having them fit well. I purchased these as a low cost headphone to use at the gym because I keep tearing up every set I take there and figured I better just get something inexpensive yet acceptable. They were that and so I consider these a success, but if you are looking for high fidelity sound to enjoy in a non-gym setting then you may want to get something better.

Cons: Must be in your ear "just perfect" to get the optimal sound. If they are in too far, not far enough or they are loose and shake into a non-optimal position the sound degrades from above average to poor. That's all more of a factor of the type of headphone it is though as opposed to a quality issue with the hardware itself though so consider that before buying.

Other Thoughts: Not the worst headphones I have ever owned either and, to be honest, considering they retail for less than $30 and I got them for less than some I have seen next to gum in a checkout line I think they are a fairly good bargain.

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  • Gary W.
  • 2/21/2014 6:21:21 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsBASS HEAVY ROCKS!

Pros: I bought these to replace my Senheiser buds that served me well for a few years. I needed more bass and these things delivered-maybe a little too bass heavy. I went to the media player's equalizer settings and tuned them just the way I wanted them to sound. Very happy!

Cons: All the wires on the plug and speakers are straight in.I would have liked them at a right angle instead but no biggie. You have to be careful about removing the earbuds and phone jack not to pull on the wires--same as any other earbuds. Time will tell about how long they last. I use mine for workouts and so far so good.

Other Thoughts: As inexpensive as these things are and as good as they have performed for me I will be buying more..................

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  • Glen F.
  • 2/13/2014 11:45:21 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsOnly paid $3 and still feel gypped

Pros: Decent sound. OK length.

Cons: One side failed after one week of office use. Usage could not have been more gentle. Only plugged into office PC. No walking around with them.

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  • christine c.
  • 2/9/2014 4:48:10 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBuy these!

Pros: Cant say enough good things about these, they really insanely good!
The bass is perfect its not insane its well balanced!
They feel comfortable for me

Cons: The highs sound a little "tingy"

Other Thoughts: I spent 24 hours breaking these in with heavy bass songs at 50% volume to really flex the speakers inside and after i did that they sounded incredible!!
I do this with all my new headphones.

1 out of 1 people found this review helpful. Did you? Yes No

  • Anonymous
  • 2/7/2014 2:59:21 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggsKoss black keb40

Pros: Its $4 shipped. Decent bass!

Cons: No mids, sticks out awkward and the cable is cheap.

Other Thoughts: Its one of those earbuds you don't feel bad if it breaks when you throw it away.

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  • Scott P.
  • 2/4/2014 1:18:19 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsRevision

Pros: Lots and lots of bass. Crisp highs. Cheap. (Four dollars on sale).

Cons: Highs are almost piercing while bass is almost too loud. Does not isolate well with significant noise. Mids still terribly recessed.

Other Thoughts: The first time I listened to these, I was in my car driving. I thought that was a good test of the isolation. Comparing these to my in ear headphones from mono price, these are really heavy on the bass, and highs sound distorted. I only paid four bucks. I got two pairs in case they were incredible. I wish I had only gotten one.

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