I bought this headset to use with a bluetooth transmitter The sound and functionality of these is great. There are a few things however that make them imperfect but for the price if you want to listen to music, you really can't go wrong.These get LOUD!! The sound coming out of them is very good. The microphone however does not work very well and people on the other side of the phone have a hard time hearing you.The other tip I have is to not have these on your ears when you turn them on and off. The bluetooth connection sounds are not controlled by the volume control and the noises will blow your ears out if you don't take them off first.If you just want an excellent pair of cordless headphones to listen to music, these are great!!!!The BAD: These are *not* noise canceling headphones, as the description indicates. The sound over Bluetooth is at times a bit noisy. Extremely irritating: if you keep them on ears while turning on or off, or connecting to the device, they play extremely loud eardrum injuring sounds. I heard the beeps a couple of times, and my eardrums physically hurt. I am returning them.I tried making a phone call through built-in microphone, but the person on the other end said they didn't understand me.The GOOD: The headphones work. Charge overnight via mini-USB and last all day. They have play/pause buttons. Rewind button works ok. Fast forward did not work on android phone.Let me tell you something,, since i was born i've been experiencing some troubles to hear like most of you, i dont even have one ear canal i even use hearing aids, and since i changed my iPod Classic to an ipod touch i ve been searching for an app to recover the loud volume i had on my first iPod, and with this headhphones im happy because they sound excellent, plus youre not plugged to your ipod, phone and you can answer phone calls even when youre playing music, and you can pair two devices, i love this thing, you can change the songs without touching yout ipod, turn down/up the volume, and once theyre fully charged they last a long time, i would buy 5 more of these if i could. you wont regret it.I purchased these for use while mowing the lawn. The audio could use more treble in my opinion, but overall its pretty good. The headphones and buttons are made of cheap plastic, but for the price what do you expect. I wish it would have used a micro usb to charge as I have thousands of those around the house. However, it does come with a mini-USB cable for charging.Overall, I'm pretty happy with this purchase.I initially opted for these wireless type headphones since earbuds are uncomfortable with my tragus piercings and bouncing/tangling wires are annoying when trying to work out.I've tried other brands but these surprised me with their sound clarify and quality. They are perfect if you like your music to not be interrupted by the sounds around you like cars or gym machines.The head adjustments are stable and stay as you put them no matter how much you move around. There are no rattling sounds and the padded headrest/ear pieces makes it comfortable to wear for long periods of time, even when running.They seem simple looking but they are great if you don't care too much about these big things on your head- totally worth it!I was excited by the descriptions and even though there were some bad reviews about quality, I asked for some for Christmas. I received them, opened the box to try them on (not turned on) and immediately the ear piece broke off at the point where it rotates just like others had said. I really HATE that because it seemed like just what I wanted but something that cannot even be put on the first time is definitely not something I want to risk re-ordering and then having it break again as seems very likely based on other comments. Just filed request for refund so hopefully Seller will be responsible. I wish there were some that were better put together because i really wanted the features this has.This was a gift for my husband. When it came, something was rattling around in one of the ear pieces, but it still worked. Then within a few days one of the ear pieces just broke off, and was dangling by the wires. In another few days after the first one broke, the second one did the same thing. Very poorly made.