The VT-1 Voice Transformer IT WILL REPLACE YOUR HAND SET FROM THE TELEPHONE  is like a simple modern-day Vocoder + Harmonizer and then some! Its purpose is to alter the human voice, ideal for DJ's, techno, and other creative uses. The VT-1 will perform such effects as de-tuning, +/- 1 octave pitch shifting, formant shifting and it has built-in digital reverb. There are four prominent sliders for the aforementioned effects. And the Robot button does in fact produce a somewhat vocoder-like sound by fixing the pitch of your voice and fuzzing it. Using the Robot effect in conjunction with the formant and pitch sliders can get some pretty weird vocoder sounds Come With Headphone of high quality and microphone. For Professional use or  Amateur, Anyway is the best unit on the market