UrbanEars Slussen DJ Adapter - $14.95

The Urbanears Slussen DJ Adapter might look like a slick-looking headphone splitter, but it's far more than that. When used with its free downloadable app (iOS 6.0 or later), the Slussen sends music straight to your speakers from your iPhone or iPod and and at the same time lets you cue tracks, control BPM, adjust EQ, and even scratch if you're feeling itchy. Team this tiny powerhouse up with your phone's music library and take your after-party music set to the next level. - $14.95