Customer Rating: 
Summary: Does not turn sound up; only turns sound down
Comment: I have discovered, as have others, that most modern TVs do not have a simple output jack for headphones. Instead they have a limited volume output set of jacks. The sound coming out of them is set pretty low and you cannot increase it using your remote's volume controls (I guess the manufacturers figure you are going to hook it up to an amp and a theatre sound system, which is not what I wanted to do.) So I heard about this product and it seemed like just the thing I needed to boost volume. Wrong. It has no power source, so if you set the dial on the unit at maximum volume, it comes to your headphones at exactly the same weak strength as emanates from the TV output jacks. All it can do in reality is turn the sound down. Skip it.
Customer Rating:
Summary: Simple but effective
Comment: The Koss VC20 volume control simplifies the volume control and the clip holds the control module at a handy position.
Customer Rating:
Summary: stay away
Comment: I had purchased a volume control at Radio Shack that worked reasonably well -- for about two months, when it broke. So I was looking for something of a bit higher quality. Good reviews here convinced me that this Koss product was just what I needed. Sadly, this is not for anyone who is even remotely an audiophile. When you turn the volume down it dramatically attenuates the high end, so music sounds not just quieter but also has a much narrower dynamic range. This item would probably last much longer than the cheap Radio Shack control, but the sound quality is completely unacceptable. So why do many people on Amazon give it high marks? I have no idea, unless they are listening to books on tape or something else that requires only low audio quality.
Customer Rating:
Summary: Works great!
Comment: I bought this so that I could easily control the volume on my iPod Touch during bike rides and it does the job perfectly.
Customer Rating:
Summary: AMAZING DURABILITY!!
Comment: What can one say about this simple, but much needed accessory??
-KOSS VC20 volume control-best one I have ever used.
Ever use an accessory rotary volume control (if you can find one)??
They usually work for a week, get a speck of dust inside, then become choppy or silent!
Most headphones are furnished with a rotary volume control,
the better headsets, of course, usually have the better quality control.
However the controls drop dead, just before the headphones do....
I mow acres & acres of lawns all season long-lots of dust & pollen.
I use the KOSS VC20 every day (going on two years)!!
If it gets dirty, a tiny squirt of Deoxit-and it springs right back!!!
Amazing durability from an $8.19 component!
Summary: Does not turn sound up; only turns sound down
Comment: I have discovered, as have others, that most modern TVs do not have a simple output jack for headphones. Instead they have a limited volume output set of jacks. The sound coming out of them is set pretty low and you cannot increase it using your remote's volume controls (I guess the manufacturers figure you are going to hook it up to an amp and a theatre sound system, which is not what I wanted to do.) So I heard about this product and it seemed like just the thing I needed to boost volume. Wrong. It has no power source, so if you set the dial on the unit at maximum volume, it comes to your headphones at exactly the same weak strength as emanates from the TV output jacks. All it can do in reality is turn the sound down. Skip it.
Customer Rating:
Summary: Simple but effective
Comment: The Koss VC20 volume control simplifies the volume control and the clip holds the control module at a handy position.
Customer Rating:
Summary: stay away
Comment: I had purchased a volume control at Radio Shack that worked reasonably well -- for about two months, when it broke. So I was looking for something of a bit higher quality. Good reviews here convinced me that this Koss product was just what I needed. Sadly, this is not for anyone who is even remotely an audiophile. When you turn the volume down it dramatically attenuates the high end, so music sounds not just quieter but also has a much narrower dynamic range. This item would probably last much longer than the cheap Radio Shack control, but the sound quality is completely unacceptable. So why do many people on Amazon give it high marks? I have no idea, unless they are listening to books on tape or something else that requires only low audio quality.
Customer Rating:
Summary: Works great!
Comment: I bought this so that I could easily control the volume on my iPod Touch during bike rides and it does the job perfectly.
Customer Rating:
Summary: AMAZING DURABILITY!!
Comment: What can one say about this simple, but much needed accessory??
-KOSS VC20 volume control-best one I have ever used.
Ever use an accessory rotary volume control (if you can find one)??
They usually work for a week, get a speck of dust inside, then become choppy or silent!
Most headphones are furnished with a rotary volume control,
the better headsets, of course, usually have the better quality control.
However the controls drop dead, just before the headphones do....
I mow acres & acres of lawns all season long-lots of dust & pollen.
I use the KOSS VC20 every day (going on two years)!!
If it gets dirty, a tiny squirt of Deoxit-and it springs right back!!!
Amazing durability from an $8.19 component!