Well I have an iPhone 4 and I had a near accident 1day with my apple headphones catching on a door handle and swinging my phone out of my pocket so I punted for this Bluetooth headset.
Works brilliantly with iPhone 4
Long battery life basically I use it at work and it lasts all week
Radio is perfect in Birmingham for brmb radio
small and discreet.
Slider volume for me is perfect.
Takes calls well and can make called with voice function on iPhone 4..
The only downside is the headphones supplies,good quality sound but tragically ear cable is twice the lenth of the other which I can't see why or how that phi sic benefits listeners .
All in brilliant wire free solution may need to search for appropriate headphones
Thanks highly recommended