8 duck hunting calls Effective, realistic and clear duck calls Bluetooth compatible to sync to a Bluetooth speaker to play the duck calls free Duck hunting calls can play in the background of your phone allowing you to text, take pictures and surf the internet without disrupting the duck calls The soundtracks allow you to set the duck calls and focus on duck hunting Connect to your speaker system with audio cables or Bluetooth (cables not included) No more forgetting to grab your MP3 player or memory cards, you always have your phone with you E-Calling audio for duck calls at a fraction of the cost of purchasing multiple soundtracks and memory cards separately