MP3 and AAC, you can only fill it with iTunes which will convert other format to AAC for transfer.
As for any background noise, try turning wifi off, it only eats battery anyway when its in your pocket. I can't hear any, best audio quality i've heard in a player.
Register
Tis a lovely gadget
What is the battery life like?
He said in the review, 22 hours easy
What audio formats does it play?
MP3 and AAC, you can only fill it with iTunes which will convert other format to AAC for transfer.
As for any background noise, try turning wifi off, it only eats battery anyway when its in your pocket. I can't hear any, best audio quality i've heard in a player.
And oh, soo shiny