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you'll need one with pretty big capacity in a 911- it will be triggered constantly due to the ride. Turn the sound off to save memory. Get used to resetting them, they lock up now and then, especially if you leave them parked and drive off. It won't wake up sometimes.
Don't bother with the parked motion sensor, worthless. They activate not by proximity, but any changes in display- so if a leaf moves in the pic, it records. Use the impact sensor instead.
Be very careful leaving the car parked for long periods, they also suck juice almost as bad as leaving headlights on.
They are janky, at best. I HAD a blackvue 550 2CH that was a PITA to live with and eventually died when it stopped reading SD cards.. They are popular but after that experience I threw it out. Nevermind.
I wouldn't buy another Blackvue....
rjp
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