These are my first bluetooth stereo headphones. I have tried them with iPhone 4, Windows 7 computer and Apple OSX leopard computer. Latency as stereo headphones is at best in the range of 100 to 120 milliseconds. This means when watching movies, the sound is noticeably behind the picture. The threshold for human perception is about 40 to 50 milliseconds, so all people will notice and may find annoying. Unfortuntely on my Windows 7 computer watching netflix at only 10 foot range, there was clipping and catch-up of the sound. Sound would drop for around half a second, then play catch up. The worst problem with these, and probably all bluetooth headphones, PITCH and TEMPO SHIFTING! I am a musician so it bothers more than average, depending on the music. If you listen to voice its not bad; but in some music, whenever there are long sustained notes, you can hear the music slow down speed up, and hear the pitch shifted up and down slightly. It seems the bluetooth stack is getting behind and playing catch up by squeezing and stretching the signal. I have noticed this with both computers and iPhone. The better the range, the less the effect of clipping and squeezing. At 4-5 feet, it's better, but at that range I can use a wired headset, right? I am a violinist so pitch changes are annoying, as well as when listening to other music, say trance or electronic, it feels like I am watching an old tv show like the incredible hulk from the 70s and 80s where the theme music on the magnetic tape is changing speed. FYI, on both my computers, I could not use stereo headphones and microphone as input at the same time. There is the old "headset" mode (like for phone calls) which is mono plus mic. Then there is a "headphones" mode which is the new A2dp stereo mode (no mic). You can only connect in one mode or the other. But you could use it as a dedicated mic input - only. This is the same for both computers. Phone calls are -as others put it- like a speaker phone. Your sound is great, but people receiving your call are getting the shaft. People tell me they didn't hear this or that when I talk when using paired to my iPhone 4. Controls buttons are not great, not well designed. I wish Apple would design something. These cover the ears but do not block out all the sound. They are comfortable and light though. I have other wired headphones that completely block out all external sound, even on an airplane; those others also sound Excellent for only $99. Pluses: wireless- handy for maybe working out, speaker quality is not amazing but very good. Battery life is very good. I am not willing to trade my better wired (and cheaper) headphones for annoying bluetooth pitch and tempo shifting, so these are going back to walmart.com. However, if you are willing to deal with the minuses, then these are a good value for what is out there.
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