Frank's Ghost Box - thoughts?

I had someone approach me in Safeway the other day. They talked about ghosts and stuff, then asked me if I had ever used Frank's Ghost Box. I have not. I was wondering if anyone else has OR if anyone has used a white noise machine to try collecting EVPs.

Links about Frank's Ghost Box

• Franks "Ghost" Box - Ghost Tech
  
• The Dead Can Hear You! Can You Hear Them? FRANK'S BOX --- EVP GHOST BOX AND A NECROMANCER
  
• What Is A Ghost Box or Spirit Box, And Where Can I get One?