I went around in my toolbox and i found one of those "Try me" buttons. i noticed the plug was 3.5mm so i guess it was for audio...i have about 15 5MM UV led's laying around so i took one of them and it fits in the button perfectly! im going to try and solder it in and i think it should turn out pretty cool. i think the led shouldnt matter because it will draw power from the device its plugged into? lol. Im already working on alittle project with my external harddrive