How can i tell? the instructions are so odd...
on reading the instructions it only goes for 2 minutes in sound mode.
the instructions..
Press Power button slightly, yellow indicator light begins to bright, now it enters into startup ready mode, which can enter into standby mode quickly. At that time, press MODE button slightly, and then you can switch into sound control video mode. Now Blue indicator light always brights, red indicator light flash quickly (indicate sound control standby mode). When decibel of video is more than 60, then it will be video automatically. At the moment, Blue indicator light always brights, red indicator light flash slowly. (Indicate under sound control video)
[FONT="]When sound control starts, the shortest shoot time is 2 minutes. After 2 minutes, if there is no any sound, D001 will save file automatically and switch into standby mode. If there still has sound [/FONT].
Does not help that i am colour blind .
Seems odd though both times it cut out after about 20 mins, on the way home i could hardly hear a thing myself as i was into a headwind and couldn't even hear cars coming.