It has the basic functionality. An input, some volume, and a speaker. The problem is that it sounds awful. And I mean really awful.
- 100-500Hz range is non-existant, but then a huge spike at 600Hz
- Very lacking in clarity
- You need to enable overdrive to get any volume
- Really, really high noise level
I'm building a better one myself from some small guitar amp and a decent mid-range compression driver. Same prize, better sound.