OK, but no more

The camera, or rather the cameras work very well, but the image quality is very average. That is enough to determine responsibilities in case of accident, but it is virtually impossible to read a license plate.
The sound is quite acceptable, but the keys vibrate and make a ruckus hell to listen (a small piece of tape immediately solve the problem).
The cables are solid and particularly long (5 meters easily than the second camera).
Gros good point for this camera: it comes with two possible attachments. An adhesive base and a base "sucker." In both cases the camera is easy to place and keep in place.
Big bad point for the camera: 3 LEDs are particularly bright to the point of being unpleasant night.
It also lacks clearly an automatic deactivation function of the screen (especially important at night).
For the rest, this camera does very well what is expected of her: automatic start / stop, synchronized recording front / back, and once the screen turned off and concealed LEDs is particularly discreet (I "hidden" behind my interior mirror and I see only when I roll).

In summary
The +
especially long cables
2 fully independent cameras
ultra discreet
easy to install

Les -
the keys vibrate and make the sound inaudible when driving (a piece of adhesive solves the problem)
the image quality below what is expected
no automatic shutdown of the display (you can still turn it off manually)
too bright LEDs.

It would not take much for this camera is amazing, but there many details angry.
It nevertheless keeps an excellent value.