Ref for the Deaf

dallas news.com: Celia Beron, 13, invented Ref for the Deaf, a special bracelet that vibrates for deaf players who can’t hear the sound of a referee’s whistle or starter gun.
With some help from Celia’s father and two graduate students from the University of Texas at Dallas, a good idea from a skinny girl with braces has the makings of a great product.
Supporters see a demand from elementary school gymnasiums to the Special Olympics and beyond.
Her concept pairs up a transmitter with a referee’s whistle or starter gun. When either of them goes off, the transmitter sends a signal to the receiver: a vibrating bracelet worn by a deaf athlete.
Richardson 13-year-old’s invention allows deaf athletes to feel signals from referees [dallas news.com]