Revolights Chief Executive Officer and co-founder Kent Frankovich demonstrates their product in Emeryville, Calif., on Wednesday, March 5, 2014. Frankovich will appear on ABC's "Shark Tank" on Friday to show off their invention: bicycle headlights and taillights that use an LED lighting system and light up the entire front and back bicycle wheel. Shark Tank is a reality television series where entrepreneurs pitch their products. (Jane Tyska/Bay Area News Group)