The audio in this video helps attract martins to your area. The audio was recorded in a colony of 300 nesting martins in Washington, IL. Recommended to play it in the morning between 4 AM and 6 AM to attract sub adult martins to the area. The original CD is 71 minutes long, this is a 6 hour loop of that CD. Good luck getting martins!!
The 71 minute CD version of this can be purchased at the following Amazon link: https://amzn.to/3r4ENr5