Jeff Cohen didn't enter "Shark Tank" thinking small. The entrepreneur sought $500,000 for 5% of Voyage Air Guitar, equating to a $10 million valuation.

Kevin O’Leary plays the guitar on ‘Shark Tank.’ (ABC) Each of the Sharks has their own guitar, and Robert Herjavec encourages Mr. Wonderful, 69, to play something.

It's easy to assume that a tech-focused "Shark Tank" company from Season 1, such as the seatbelt-detection device LifeBelt, would be defunct by now.But Voyage Air Guitar has defied the odds ...