20-minute MP3 file of a German Shepherd Dog and a Norwegian Elkhound/German Shepherd mix dog loudly barking. Use in a boombox or stereo system for home protection. So realistic, it will sound as if the dogs are actually in your house frantically barking at a potential intruder. You will receive a download link in the Thank You page of checkout along with an emailed link that will last for 30 days. Added personal protection for yourself or a loved one who can't have a real dog!