The headphones look like iPod headphones, only blue. It says on their website it takes a standard headphone jack with 20mw and 16 ohm output. It appears that you can use any set of headphones you wish.
Search any of the "music while riding" threads that seem to pop up once a month for better info on which set of headphones to use.
http://shop.sirius.com/edealinv/servlet/ExecMacro?nurl=control/StoreItem.vm&ctl_nbr=2640&siId=2885794&catParentID=7874
Search any of the "music while riding" threads that seem to pop up once a month for better info on which set of headphones to use.
http://shop.sirius.com/edealinv/servlet/ExecMacro?nurl=control/StoreItem.vm&ctl_nbr=2640&siId=2885794&catParentID=7874