as Andy said, if it's the HPM-10 (which works with most SonyEricsson phones), it's completely shite. I've had mine for bout a year and used it twice, can post pics and a better description if you want, but it's really not a product worth spending money on.
It connects via the Ericsson legacy connectors at the bottom of the phone, as soon as you put it in your pocket/sneeze/raise an eyebrow, it disconnects
on the site which shown below there is a pic for Motorola MP3 Player - MPP8000, if anyone has any idea about this device plz tell me, for example; how do the songs dowloaded to this device?
In the other way, using this device enable you to listen to the songs only or watch the movies also? and about the songs, can the user record the songs to the device's memory or not? and if he/she can how dose that??