but 70mai is cheap tho.. 

I use this China recorder. It use my reverse camera for rear record.

Buy this :

https://www.lazada.com.my/products/car-char....526b49fbFekqTG
 

and tap power from fuse box using this :

https://www.lazada.com.my/-i209699097-s2626...lFlag=true&mp=1

Depending on type of your car you will need to find the correct type of fuse before you buy the fuse tap adapter.

You can check this video on youtube. For your case it would be the usb cable that you want to wire to the back to power the second dashcam(you might have to buy an extra long cable). So just remove the rubber seal and put your wire in there..

Just depends when you come to the rear of your car.. If yours is a hatchback its a bit difficult if you want to 100% hide the wire since you may need to open up the trim of your car. But if you don't mind, you can just let the last few meters show a bit and not worry about openning the trim.

Bro I got extra unit 70mai dashcam. U want?

If u want install rear. Just get longer wire pull to front. Or cable extension. Pull up some interior to hide the wiring. It would look nice in the end

Ori of course. Never heard of fake one though. It's new

Chinese one. I think I have a link. U can change to English. I don't need cause I know Chinese xD

would the quality sucks?