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Mine shuts off after a bit of time, maybe 10~20 minutes or so (never really timed it), unless dog mode is on, but then there is no music and the screen is locked.
I was cleaning the inside of the car this weekend and then let the heater go to warm up the garage a bit and listen to music while...
For myself I wanted one that could be easily removed since Ohio is removing the front plate requirements next July. (But I'm sure they back out of it before then)
This just happened to me yesterday where i went into the garage and the pedestrian warning sound was coming out of the car. It was the white noise (forward) and the car was parked (mirrors folded), screen off, and plugged into my wall connector (charging completed). Took it out a few hours...