To reserve for handymen and again?

Received quickly and quickly disappointed testing:
First observation; strange noises inside? that's roam
After connecting; that is blurring day and night in addition all LED does not light
so I chose an opening that confirms a danger because the main board is not fixed
repair and new drilling screws; new test for sharpness: unobtainable
replacing the lens, so buying a better quality lens and testing: it is much better.
Conclusion: reserve the right camera for handymen work for proper operation awaits.
it's a shame that manufacturing is so bad because with a little care it work.
I hesitated more than once to return .... more impossible to contact the supplier?
The next will not this brand