This dual-channel dash cam’s second camera marries to the main body for interior coverage and detaches for rear view use.

The most distinguishing feature of the Aukey DRS2 ($150 on Amazon) is its interior camera, which can be detached from the main body for use as a rear camera. Nice, but its best trick is taking excellent video, both exterior and interior, day and night. It could use integrated GPS (an $20 external option that’s $20 on Amazon) and a larger capacitor, but beyond that, it’s all good.
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https://www.pcworld.com/article/3489037/aukey-drs2-dual-dash-cam-review-excellent-video-in-all-directions-and-infrared-too.html