I got these optional extras as well, as the camera is primarily going to be used on my motorbike so the extra battery means I wont run out of power. The car charger and mount means I can use the action cam as a dash cam too.
Yes,the sj4000 camera has car dash cam mode (cyclic)
on a side note I took the SJ4000 out to show my LED light bar. I have bearmach crystal headlights and they look like frigging candles compared to a 288w light bar I have yet to angle video soon
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