I had one, and I sold it, or guess I gave it away. But I won't have one again. For me, and using just the one, I could here sounds that I normally couldn't hear, but our hearing is supposed to work in stereo, so with one "bionic ear" I couldn't tell what way the sound was coming from. And if there is a breeze blowing, it sounds like wind, and if the leaves are blwoing in the breeze "wind" they sound like your in the middle of a typhoon. So, at least for me, I'd rather just be alert at all times, and live with the fact that I may not hear the game before I see it. Oh, and them darn foxtail squirrels scurrying in the leaves will get ya on your toes more often than not. I can see, that maybe with bad hearing and trying two of them may help some, but they aren't for me!