Not that I don't know how to track a blood trail, I do. Was wondering if anyone ever used one of these gizmos. One ad claims it can locate a deer size animal/human @ 300 yards, rabbits and birds up to 50 yards. So I looked for reviews on the internet, only was able to find one. This guy sez his would locate a large dog @ 20 feet, but that was about it. A fool and his money are soon parted as they say. Thought it might be usefull finding a downed Pheasant in tall weeds and smashed down corn, since I don't hunt with a dog. Dog might be a better investment. T.