This double open reed design produces simultaneous sounds of two estrus cows competing for the herd bull. You can also create excitement by sounding like multiple cows and calfs. Bulls cant resist the various mews of this call; the sound capabilities are endless. Double your chances of calling em in On The Double. - Produces sound of two different estrus cows at once - Allows user to mimic sound of two cows fighting for attention of the herd bull - Two reeds allow complete range of sounds