I picked up one of these on Ali Express for around $160 mid September.   More details can be found in this link

https://www.youtube.com/watch?v=WpHqODLBd0w

Because I wanted to use this on one of my air rifles at under 30m, I went with the 16mm lens that gives 5x maximum magnification.  Overall I'm not impressed with this device.  I cannot get the diopter adjustment clear without using my glasses.  Neither day or night mode is quite as clear as the video above but it is adequate.   As you may have noticed in the video above, both the charging port and the micro SD slot are not covered which would require taping up to provide some protection in anything but clear weather.  

I fitted one of these adapters  to the existing dovetail to mount this on my rifle

https://www.trademe.co.nz/a/marketplace/sports/hunting-shooting/scopes-sights-mounts/mounts-rings/listing/5648895571

Even with is as far back on rifle as possible the scope was not far enough back to be able more than half the screen on the night vision scope.   The depth of field is quite limited so when scanning different ranges, you have to keep refocusing the image with the front lens on the scope which is a pain when mounted on a rifle.

I ended up putting the original scope with a torch back on the rifle and using this device purely as a spotting scope which worked OK.  I can get away without glasses when using the night vision just for spotting which is a little easier than having to keep swapping as my scopes are set up for using without glasses.  Also even with the minimum brightness on the night vision it ruins my night vision so I need to use my left eye for spotting to then enable me to quickly target with my right eye and the scope on the rifle.  For the possums  I was targeting I am able to see the chicken feeder from my kitchen window which means I can check this from  inside and then sneak out when spotting activity.

While this has worked OK as a spotting scope I would have been better off simply buying a night vision monocular than this device.