I am really impressed with this Mirror Dash Cam (Front & Rear). Here are my Pros and Cons:

Pros:
Camera (picture) quality is very sharp, colors are perfect. There are 3 quality settings;
Front Only = 24 FPS; 2160P
Front Only = 30 FPS; 1440P - smoothest playback
Front Only = 24 FPS; 1080P
Front & Rear = 24 FPS; 2160P + 1080P - a little jerky during playback because of the details in the pictures
Front & Rear = 30 FPS; 1440P + 1080P - smoother playback since more frames per second
Front & Rear = 24 FPS; 1080P + 1080P "“ keeps the playback of the 2 cameras in sync better

Download the FREE WolfBox Player or play the recordings directly from any video player that supports .TS files (most players do)
Both of the camera's day or night recordings are extremely clear and can easily read license plates

Abundant Settings to control the cameras (see attached picture)
Loop Recording increments of 1- or 3-minute segments, oldest recordings are overwritten by the newest recordings
128 GB card = approx. 11 hours of recordings before being overwritten. but since it loops you could get by with a smaller card. The 128 GB SD micro card is around $17 on Amazon for Samsung U3 A2 V30.
Audio quality seemed fine. Can hear my music, any talking, and engine accelerating

Hardwire Kit required for Parking Mode and IMO is a MUST HAVE as it turns off the camera when you get out, but still supplies power to record if the Parking Mode G-Force sensor is triggered and it doesn't drain your car battery.
The Rear Camera includes a red wire that connects to any reverse light that shows the back-up lines when in Reverse
I put this camera in my Silverado 2500 Long Bed Crew Cab mounted to the inside rear-view mirror. There was plenty of extra wire for the power (both in the supplied cigarette lighter and also the hardwire kit). For the rear camera cabling I used the 33-foot (10 meters) extension cable and it was enough to run from the rear-view mirror, into the door molding to go outside and under the truck, hiding the wire all the way to the bumper with plenty of cable left over. Thankfully they include a plastic trim spacer tool that helps tuck the wire into the trim moldings.

Easy to deploy firmware updates
I love the 12-inch display (inside mirror) for the picture quality and also the Touch Screen for selecting the various options.
Fantastic Customer Support responds within 24 hours to each email and are genuinely concerned, kudos!!!

Cons:
Hardwire Kit, took a little over an hour to install, but worked perfectly the first time
I initially had an issue with playback on Windows 10 desktop using GPS Player or using WolfBox Player had no audio. I finally discovered a setting for Spatial Sound (new in Win10) set to OFF by default. Change setting to "Windows Sonic" or to "Dolby Atmos" and that allowed the audio to play perfectly. Search Google for how to easily change that setting for Windows 10.
G-Force detection set to LOW creates recordings when hitting bumps while driving and even shutting doors. Medium seems to eliminate False Triggers and is sufficient to monitor Parking Mode triggers.
Must mount the Rear Camera with Flat side UP or the recording is inverted
Day Light Savings setting manually moves the time forward or backward, it's not set automatically

Hope this review helps someone deciding if this camera is right for them.

The only reason I deducted a star was due to the fact that I need to connect to the cams WiFi to view the video. I thought it would connect to my home WiFi and I'd be able to view the videos via a portal where it would keep my videos on a cloud service. I guess I was asking a lot for a cheaper solution. For the price the unit is of great quality. I just find it redundant that the videos are only viewable if I'm on the cam WiFi or take the SD out and view on my computer. Useless if someone breaks into my car and simply steals the SD. Then they get away with it and I have 0 evidence. Or if someone steals my car entirely, then I have nothing since the video is only locally available. I wish it could upload to a service or even connect to a google drive or drop box that way I can view videos at anytime and I'd feel a lot more confident in the service. Only really good for catching hit and run incidents. Good enough for the price I suppose.

This is a great camera system. Mirror dash cams are definitely a different breed but in a good way. Almost everything I dislike about regular dash cams are not an issue with this WolfBox 850 model. I installed the camera and all accessories myself. It was a big deal to get the rear camera installed, location, wiring, tapping into the reverse light power, but that is true for all rear camera installations. One could always take to a professional if needed. The end result is awesome and totally worth my time. I am so impressed with the touch screen functionality. All settings, viewing, playback, switching cameras are immediately accessed via touch screen, and mirror dash cams do not take up more window real estate which I like. The picture is great and can be adjusted up or down as needed when recording. If you need to look at files on a PC, the WolfBox Player works great and has map tracking capability. I installed the hardwire kit for parking monitoring (only up to 24 hrs) and collision capability. When the mirror cam is off, the reflection is a little on the dark side, but it gets the job done for my needs. I really do not want to use the screen saver as I would rather constantly see the rear video stream. I do, however, have one issue with how the front mirror cam attaches to my old mirror. My mirror has OnStar buttons that protrude along the bottom. Therefore, my mirror is not straight across the bottom, and it keeps the mirror cam from fitting perfectly (see pic). The attaching mounts should be about an inch more apart or offset a little since the camera lens is on one end of the mirror cam, thus keeping it from being centered on the old mirror. Also, larger mirrors will stick out on the other side slightly. I contacted customer service and they were the simply outstanding! My solution was to use their mirror mounting bracket (see pic). This bracket replaces my old mirror completely. I will lose OnStar capability, but that is not an issue for me because I do not use it. Hands free calling still works with the OEM mirror removed. I am completely satisfied with this mirror dash cam. Not everyone will need to replace their mirror, but it is a clean look to do so, and it increases the awesomeness and functionality of this mirror dash cam system.

The media could not be loaded. I got this Wolfbox camera for a very good price, and replaced my older (technically illegal) Z-Edge dual dash cam with it. It's about the same price as the Z-Edge, but has a much larger screen, better interface, and like I said is not illegal. The reason some Dash cams are illegal is that they partially obstruct the windshield (like my Z-Edge). The Wolfbox is fantastic because it actually attaches to your rearview mirror and does not obstruct any of your view of the road.

Accessories and additional items included in the box(the dashcam is obviously included):
Silicon attachments (use these to hold the dashcam on the mirror, there are smaller ones for smaller mirrors which I used, and larger ones for larger mirrors)
Microfiber cloth to clean the screen
Power cord
Rear camera
GPS attachment
User manual

Installation:
As mentioned, you just attach the silicon stretchy brackets to the upper back hooks of the dashcam, hang it over your mirror, and then attach the lower part of the brackets to the lower hook on the dashcam. You then can attach the power cord and rear view camera wire and run them behind your paneling (I attached pictures and a video with a brief summary of how I ran my wires). Plug in the GPS (attach somewhere out of the way with the 3m tape), and then plug in the cigarette lighter adapter. Voila! You are good to go. Don't forget to take the protective plastic off the cameras (not that I have ever forgotten that haha).

Great features that are included:
General direction you are driving (N for north, SE for southeast etc.)
Time and Date
Speed
Screen Saver mode (in Screen Display under settings, talk more about this later)
Sensitivity adjustment (how big of a bump you want for the camera to recognize a "crash")
Brightness adjustment (turn it down to low, or use screen saver mode if you want to use the camera as a mirror instead, talk more about this later)
A very responsive touch screen
Button to take a picture
Change resolution (options are 4k, 2.5k, and 1080p. Default is 2.5k.)
Loop time of the recordings (options are 1 min, 3 mins, 5 mins. Default is 1 min)
Whether you want to record audio or not.
Option to attach the reverse line so the camera will automatically turn on the reverse camera when reversing
Can flip the rear camera (this means you can install it upside down or rightside up if you want)

Important things to note:
Running the dashcam requires a small amount of technical skill. Not much, since I am not super car savvy. However, if you want to setup the cameras in the best position possible you may have to get creative (I'll talk more about this later). HOWEVER, if you want the rear camera to automatically turn on in reverse, you have to splice or crimp the red reverse line into your reverse lights. This requires the correct tools and know how, which I did not have. I had to get a mechanic friend of mine to install it. He also installed the rearview mirror on the outside of my vehicle, above the license plate. To do this, he had to drill a hole behind the rear lights, run the wire through there and then out with the license plate light. If you do this, make sure you don't drill a large hole and then you weatherproof the hole with some sort of rubber, otherwise water will get in and rust out the car.
This dash cam functions as both a mirror and a dashcam. What I mean by this is that if the screen is off, it will act as a rear view mirror and you can see through the window behind you. If the screen is on, it will still show the rear view AS WELL as the footage on the camera. This can be a bit distracting, so what I do is I choose to put my Wolfbox in "Screen Saver" mode in the settings options. This turns off the camera while I am driving, but leaves on the nice features like direction and speed. My friend who also has this camera, instead chooses to just leave the camera on but have the rear view on all the time. Essentially he uses the camera instead of a mirror. One thing to note if you do this, is that cars will be closer than they look in the camera.
The manual is written with poor English grammar, and does not explain the features well. It requires some trial and error to figure everything out yourself.
Installing the rear camera in the recommended position above the license plate means that cars behind you shine their lights directly into the lens. This can make it hard to capture details of the car behind you at night.

PROS:
Lots of great features
Large screen with nice touch interface
Clear picture
Relatively easy to install
Legal
Easy to use
Option to use as a rear view mirror, or use the rear camera to see behind your vehicle.

Cons:
Poor grammar in manual
Hard to see license plates at night
The camera lens quality is good but not great, resulting in a picture that is useable but not as clear as I might like.

Overall my cons are mostly just nitpicks, and I think this is a fantastic camera. I would not hesitate to recommend it to anyone interested in installing their own dash cam.

A really cool feature they could add is Google maps functionality that displays google maps on the camera. That way I wouldn't even need my phone anymore. But that would require adding some totally different programming, so it's mostly just my own wish!

love this rearview dash mirror camera just straps over your old one and works fine records front and back would not take anything for this dash mirror camera also has audio 64 gigi bytes every chance you get clear the sd card camera so you can have more recording time if you dont know how to hook up the wireing to fuse box just use the auxiliary port always up plug from auxiliary so you dont run your battery down i would highly recommend this camera windshield cameras is nothing compared to this camera this one wont fall off those that stick to your windshield always in up in the trash