Slick, slick, slick. What do you need in order to control a radio? A knob for the volume and a knob for tuning into stations. The hidden radio does both without having either.
By lifting on the cap the volume is increased, and by rotating the cap you can tune into the station you want. The only indication (besides your ears) that you are closing in on the right frequency is the LED on the front panel that becomes brighter as you get closer. Intuitive to use and good looking.