Connect the app to your speaker and amplifier system to play the deer hunting calls loud. FEATURES: - 17 blacktail deer hunting calls - Effective, realistic and clear deer calls - Bluetooth compatible to sync to a Bluetooth speaker - Deer hunting calls can play in the background of your phone allowing you to text, take pictures and surf the internet without disrupting the deer calling sounds - The soundtracks allow you to set the deer calls and focus on deer 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 deer calls at a fraction of the cost of purchasing multiple soundtracks and memory cards separately Soundtracks included in "DeerPro" - Buck Grunt - Deer Call - Grunt 2 – Deer Call - Grunt 3 – Deer Calls - Deep Buck Grunts - Multiple Grunts – Deer Call - Wheeze – Deer Call - Extended Wheeze – Deer Call - Snort – Deer Call - Snort & Grunt 1 – Deer Call - Snort & Grunt 2 - Deer Call - Multiple Snorts – Deer Call - Antler Rattle – Deer Call - Doe Grunt – Deer Call - Doe Bleat – Deer Call - Doe Distress 1 - Doe Distress 2 - Lost Fawn – Deer Call Download BlacktailDeerPro and start having deer hunting success today!