I have a garmin dashcam and it has a micro sd card, also can connect to wifi. Easy to install and even alerts to lane departure and collision alerts. Also records if vehicle disturbed while parked. Also records audio.

Only looks forward. Haven't needed it yet but feel better with it in my truck.

Now that I have one, doubt I will go without.

"It is the mark of an educated mind to be able to entertain a thought without accepting it"