i usually don't leave reviews, but this time i am, just in hopes of helping out someone else in my position.i bought these headphones because i've been wanting to listen to my iphone on my runs without getting tangled up in wires. i have an iphone 4; i put the headphones in pairing mode (per the instructions), opened the settings on my iphone, went to general, then bluetooth, and the iphone found them immediately. i selected sony drbt50 and the connection was made instantly; i did NOT need any type of bluetooth adapter. it's been over a week now, and the connection has never been lost. i have never had any kind of interference or cutting out that some others have described, but i only wear these when i go running, so the headphones and iphone are literally less than a foot apart.the headphones themselves give great sound, the same as my wired sony headphones i bought about a year ago. the foam cushioning makes them comfy, and i simply flip the cups out overnight and let them airdry. even on the tightest setting the headphones are a little big for my head and have a tendency to slip back if my ponytail isn't secured high enough, but i have an awfully small head, so this shouldn't be a problem for most anyone else. they're lightweight, and pretty sturdy - i carry around a duffel bag for school and work, and i just fold them up, slip them into the provided carry case, and drop them in my bag. i know some are a little ambivalent about the controls on the headphones, but i love them. the volume buttons are press, fast forward and rewind are achieved by flipping a little lever up or down. it's great, because now i don't have to press the home button on my iphone, slide it unlocked, and wait for the ipod screen to pop up so i can change songs; even when the iphone is in default lock mode, the headphone controls function without a hitch.for any other runner out there looking for a great pair of no-hassle, wireless headphones simply for listening to music while running - GET THESE!