There was one around the house when I was a little kid, and I used to "play" it all the time. Oh boy is it ever sensitive to breath pressure!! I seem to remember the top section was detachable, and by taking it off and blowing on it, hard, you could make the most wonderfully awful noises. Ours was black, with a sort of 30s-Bakelite look to it, and it had been lying in the piano bench for years before I discovered it. But it also gave me (if not my long-suffering parents) hours of pleasure, as did a ukelele and the piano (the last of which I could also listen to live, as my mother was a fine pianist). The Tonette is one of those cheap-&-cheerful kid-proof instruments which are a great introduction to hands-on music making. So are ukes (see Kat's recent thread).