1.K12 unboxing video

2.How to mirror iPhone&Android devices to K12?

3.How to adjust image brightness and aspect ratio

4.K12 How to clean dust

5.K12 How to install the ceiling

6.K12 How to connect the remote control

7.K12 How to autofocus

8.K12 How to zoom in or out on a projector

9.How to focus using the remote control