This sound is from Bruce Buffer

Bruce Anthony Buffer is an American professional mixed martial arts ring announcer and the official octagon announcer for the Ultimate Fighting Championship (UFC) events, introduced on broadcasts as the "Veteran Voice of the Octagon". Buffer's catchphrase is "It's time!", which he announces before the main event of a UFC card. He is the half brother of boxing and professional wrestling ring announcer Michael Buffer, and is the President and CEO of their company, The Buffer Partnership. Buffer holds a black belt in Tang Soo Do and has fought as a kickboxer.