http://gizmodo.com/344202/skullcandy-double-agent-headphones-have-built+in-sd-slot-bypass-the-mp3-player
"These new SkullCandy Double Agent headphones are awesome because they directly read from an SD card, without the price of Bluetooth headphones or the need for an MP3 player. They hold any size SD card, feature a rechargable battery, come in three colors, and have side controls"
Sound kinda cool. SD cards are gettin pretty big now (multiple GBs) so you could have a bunch of songs. I wonder if the quality/durability is any different.