American football players often have trouble hearing the whistle due to high intensity play, physical contact, adrenaline, and extremely loud crowds; so, they continue to throw, run, and/or tackle without realizing the referee(s) has stopped the play. This presents an added danger to the game and results in avoidable injuries that occur after the play is over. To increase player safety, this project consists of designing a secondary tonal system, placed in helmets, that alerts football players that a play has ended. The electronic whistle transmitter and receiver system uses low frequency wireless communication between two custom printed circuit boards that delivers an audible tone close to the players’ ears when the electronic whistle is activated. The electronic whistle transmitter and receiver system acts as an additional safety measure for the athletes.