I use my Android phone (Moto Cliq)
It came with a video camera app, I downloaded a free voice recorder app.
Tested it at 2 ft, 6ft and appx. 10 ft. Voices are clearly audible. Also tested in my pocket, same result... though there is a bit of "static" sound from the fabric of my pants rubbing on the mic.
10 hours of record time means I can start it and let it roll all day long... just about...