First, loosen the screw at the bottom, then open four buttons marking with the white ring, thereby opening the case.
Hardware has been installed. The last step is to debug focus. Rotate the lens through the lens mount and turn the lens with hands. Because of H107C without instant image output function, you will need to take video, then check weather the focus is right on your computer. It needs to repeat 4 or 5 times for achieving relative perfect effect.
When everything is ready, you can take video by wide angle lens.