I have set up two different ones. A Thinkware in my truck and a Garmin in my wife’s car. Mine has front and rear, while hers is front only. Both have been going strong for a couple of years.
One key feature for me was the availability of an OBD-II adapter to power the camera. Both of these have that available as a $50 add on. Basically, it’s a plug that goes into the diagnostic port your mechanic uses, and it powers your camera and automatically detects car-on/off and switches modes for you.
Get a car trim removal kit cheap on Amazon–just a bunch of plastic spatulas and wedges. Use that to help sneak the wire under the trim from the mounting point down to the OBD-II port. It takes about fifteen minutes to sort this out, and it looks so polished when it’s done right. You don’t always need to actually remove trim, just lift it a little with a plastic prybar while using a plastic pokey thing to persuade the wire to go under the edge.
Don’t buy cheap microSD cards. These cards are in hot or cold conditions, being overwritten daily, or weekly at best. The whole point of a dash cam is to provide evidence of an incident after the fact, and you don’t want to find out that your cheap card failed. Use one of the ones designed for heavy service, made for dash cams and the like.
Don’t expect to be able to read license plates. The wide angle lenses make it so you really have to be square on and close to read them. Because of this, always remember to read the plate number out loud so the dash cam can record you saying it…presuming that you enabled audio recording. After reviewing my videos, it became clear to me that mine won’t really help with a hit and run–too hard to get a plate in those conditions–but it’s still going to document the event for police and insurance.
Test your videos! Have fun with this–if you saw some particularly boneheaded move on the highway today, go home and download the video; saw a cool car? download the video. This will make sure you are actually recording, and will orient you with the process for downloading.
If you need to, make a written cheat sheet on a card telling you exactly how to download a video from the camera onto your phone. It’s still a fiddly process, and you don’t want to be in time of need and not be able to get the video.
Don’t give a cop your camera or card! If it disappears, even through no fault of the officer, you have lost your evidence.