Check out UBMT (Ubiquitous Multimedia Technology) View-T Wide camera system for cars. It has a front and rear camera that can record in HD (1280 x 720) quality, with a 3.5-inch screen for split real time view.
Shaped like a camera, my first thought is that it is a camera. On closer look, you will realize some differences. For example, the back is a full 3.5-inch screen. No special buttons and not designed for you to hold.
Top view
On the top is a latch that looks like a cold shoe for camera flash. It is actually catered for mounting this camera on the windscreen.
Here is the mounting.
And the lens is super big for a car camera system. The lens has a 140 degree angle.
Here is the MicroSD card slot.
Power on/off switch
And here are some accessories that you can connect to the camera.
GPS Module
Additional Battery Module
I forgot to take the picture of the rear camera. Here is one picture from their website.
Here are some specs for your reference. One important feature that I need to mention here is that it has buffer memory in it. That means there will be no gap in the segments while recording.
Click Here to Check Out their Official Website
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