It's important not to confuse stepping-stones with destinations, but that doesn't mean you can't still celebrate incremental progress.
With that in mind, here's an incredibly polished but ultimately not-quote-right Waltron prototype unit.
(If you're wondering why it's a prototype and not a finished product, it's down to User Experience: the "portrait" orientation looks nice but isn't actually easy to hold and use at the same time!)
Book recommended but not included.
Controls: internal volume potentiometer, photoresistors, buttons, on/off switch
Dimensions: 2.3"W x 3.8"L x 1"D