I'm not a DJ, but I like music, preferably different scratches. I even tried it at an old soviet turntable once.
And once, while strolling up and down with an MP3-player and twitching the volume up and down, I thought that it would be so deck to have two little turntables in my pockets. So you can make scratches while listening to some songs or radio.
That's how I came to the idea of "Scrachy" — comfortable plastic thing 35 x 35 mm. Two buttons: one is for on/off (with a protuberance for easy groping), another — to change the radio-MP3 mode. Independently rotating on 360 degrees corrugated ring -- volume regulator; and a touch-disc to make scratches (let it read the pressure level).
Play, stop, next song — all mapped to the mode-button. No screens, no LEDs. Synchronized and recharged through the mini-usb. Audio-jack for standard phones. Player is comfortably fixed in the hand, yet you can easily play DJ on the table. One complete set consists of two turntables as a default.