On the problem with the lack of sound: Simply package with video Codex eg re-install of Chip.de. Then you can also use the Windows Media Player and Movie Maker with sound. Time spent at most 5 minutes.
Update:
I had also wondered about the low point of view. With full HD resolution I came to about 90 degrees. You can check in which you hold the camera at 45 degrees on the corner of a rectangular table or for example along a rectangular street corner that easily.
However one chooses the 720p setting, you get a much wider view angle in a direct comparison. In my estimation, these are indeed across the width not 170 °, about the size that could get there but.
Update after 2 months: Also this specific copy is exactly as in the two identical Polaroid XS100 died the same "death". First went the system time and then increasingly discontinuations in the recordings, Files tw. unreadable, the camera is no longer charged. This is a shame because the concept is absolutely correct. A fourth attempt but no longer I like company. When I had the ordered here, but it cost only 89 euros. Maybe that's the face of really rich fastening material, USB charger etc. but too cheap? I change the assessment therefore of **** to only *