Update:These worked great for a while. Shortly after buying them, it stopped working. I called customer service and they said that sometimes the gold connectors need to be rubbed with a lint-free cloth. This seemed a little odd but I went ahead and did it. Still didn't work. The customer service rep had me return the package and sent me a new pair. They also worked for a short time and died. They wouldn't turn on at first but if they stayed plugged into the wall, then they'd work. However, shortly after that, they wouldn't turn on at all or charge anymore. Useless. I threw them away. (I have a BlueAnt speaker phone and love it. Have had it for a long while now and it's still working great. I especially love the long battery life.)I also did a lot of research regarding this and other wireless headphones. I think it's a 4.5 star but there isn't intervals. I'll explain below why I didn't give it a 5 star review. Here's my experience:SellerGreat. No problems. I bought it on Friday and it shipped from NY on Saturday. I'm in Hawaii and it was here by Thursday.Charging the batteriesThe instructions said to charge them for at least two hours before using them. I plugged one (headphone) into the AC/DC outlet and then had to plug the other one (Audio Streamer) into the USB on my computer since it only comes with the one AC cable. According to the instructions, the light is supposed to be red, indicating it is charging. Then, when it's done, it is supposed to turn blue. Well, that's what the Audio Streamer did, but the headphone was red with an occasional blue flash. I tried swapping batteries between the two devices, but the headphones continued blinking blue every few seconds. Worried that it wasn't charging but not having any other option, I left it that way and when I came back several hours later it was a solid blue. Since then, as I've synced it and used it, there doesn't seem to be a problem, so cross my fingers.SyncingI must admit, it was a little frustrating getting it to sync to the Audio Streamer. I got it to sync first to my iMac via bluetooth and it sounded great. I couldn't get it to work with the Audio Streamer so I gave it up for the night and went to bed. When I got up the following morning, I tried the Audio Streamer again, without doing anything else to it, and it worked. Go figure.UsesI wanted to use the headphones for several different things.1st-With my computer (2008 Apple iMac). As noted above, it synced without problems and sounds great in stereo. I'd say it's about on par with the standard iPod earphones. When I go the length of the apartment with two or so walls in between the headphones and the computer, it starts to skip a bit.2nd-With my iPhone 3GS. There were no problems syncing with my phone. It also sounds great listening to music. The microphone plugs into the mini-USB port (also where the charging happens) and there didn't seem to be any problems with answering calls or sound quality. However, I really didn't buy this to use with phone calls and seeing how the microphone needs to be plugged into the mini-USB port, which means I have to carry it around all the time, I'm glad I wasn't planning to use it this way very often.3rd-With my TV. I really wanted to be able to use this with any standard television so I can play games or watch TV without bothering my spouse. This is where I was slightly disappointed, and thus the lower rating. I was really excited that it came with an Audio Streamer allowing it to hook up to pretty much any device. I figured it is sent over Bluetooth technology and would therefore sound exactly the same as when I was listening to my computer. However, the sound isn't very good and there is a constant rhythmic tapping sound which is actually a little bit of static. It was really bad at first, but after repositioning the Audio Streamer a little bit, it seemed to be less noticeable. Once I got playing my games, the static wasn't as noticeable as my mind was concentrating on what I was playing. I haven't watched much TV yet with it so I'm not sure if I will be able to ignore it as easily. It reminds me of listening to a radio with a not-so-good antennae.4th-With my PC at work. I get so tired of the cables trying to listen to my computer at work. If I move my chair around the cubicle at all, I pull the earbuds out. I haven't taken them to work yet to try, but I'll have to use the Audio Streamer seeing how my Dell PC doesn't have bluetooth, so I'm assuming it will sound the same as when using it with the TV, static and not as clear as when it uses Bluetooth connection.Overall, this works well. I like the design and feel, although when I have my glasses on it starts to pinch behind my ears after a while. Contacts solve this problem. I would recommend this to anyone looking for wireless headphones.