Functional custom headphone design

Hi everyone! I am looking for someone to design plans / manufacturing drawings for a functional device. The device is basically like headphones but would have miniature in-built microphones on the outside and then speakers on the inside. The device would then take the input from the microphones, send it through an auto-tuner or pitch filter and play it instantly back through the speaker into the ear to produce an effect similar to this: [login to view URL] The design must use existing technology and be actually functional once built via the drawing specifications. It should have an on/off button and would be possibly either charged or battery powered. The design might also incorporate an option to choose from different pitches or styles of pitch filtering. You would provide the name of the hardware used. For the actual look of the headphones, they should be very sleek and modern - looking similar to this: [login to view URL] To show you have read this, please start the bid off by naming your favourite colour. Lower bidders are more likely to win. Cheers, Daniel