The back of the RDP-XF100iP is surprisingly bulky for a portable speaker system, compared with recent offerings from Altec Lansing and Logitech. If you're looking for loud, deep sound, though, it's easy to forgive the speaker's heft and thickness.
Across the top edge of the speaker you'll find an illuminated power button sitting alone on the left, as well as 11 additional buttons. Eight of those 11 buttons are grouped around the center, offering a mix of track control, radio tuning, system menu control, and radio preset skipping.
Another little feature we're happy with is the inclusion of a remote control. The remote has all the functionality found on the top of the RDP-XF100iP, and actually responds a little faster than the button controls. The range of the IR remote isn't great, but you can expect the typical 15- to 20-foot range.