Well to give you an idea of how install would work non-hardwired (it should be noted that I'm not a professional, by any means) but in my car, I have the cam mounted with the power + rear cam cable tucked into the trim of my roof.
Pulled off the weather strips in my door to hide the power cable going down and out underneath my glove box.
Used the included cable clips to make the cable snug underneath and then plugged into my cig port.
Just enough slack to unplug the cigarette power adapter if needed.
The rear cable I went up over my seatbelt trim (being careful of where any airbags are), and once I had it at the back window I just triple stuffed the cable up into the gap of trim between the roof and window.
Haven't noticed the cable falling out back there, yet.
I had a bunch left over though, so we'll see if it slips out over time.
My install isn't meant to be a long time install though, so that's the biggest reason I didn't hardwire.
The cam does come on automatically when you start your car if it's hardwired, but it does so when plugged into your cig port too
Having it hardwired allows it to stay ON while your car is off.
& as
@kamkar1 mentioned, it's important to have some sort of voltage cut-off option so your cam doesn't drain your car battery in parking mode.
The BlackVue Power Magic Pro is the device to get for hardwiring, you can have it set to turn off the camera either by a low-voltage setting or by a timer.
