i already had a sony cd player but after having a new mp3 player i decided to upgrade to one that is able to play music through a usb port and had a aux input. this was really easy to fit and as i aleady had a sony i did not need any more fittings. i love the way i plug my usb mp3 in and i can still do all the things like shuffle album or shuffle all songs on the usb with the touch of a button. the usb stays in place which i was suprised going over lots of bumps. it gives out and amazing sound and i only have basic speakers fitted so it is pretty impressive. for the price of this unit it is well worth it i wouldnt hesitate to recommend to anyone looking for a new stereo at a great price and a brand you can trust.