Beste Dashcam 2018 Aukey Dual. It works entirely as a slave to the main unit. I emailed aukey and they said they would inform me if it becomes available.

These are dash cams that have one camera recording out the windscreen, and one camera out of the rear window. We’ve reviewed most of the major front and rear dash cams on the market today, and found enormous differences in quality and what. I realise it's best to have this gadget fitted much like one should wear a seatbelt or a helmet.