AVer SF2111H-DVR user manual - Manual (Page 11)

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3. Installation Tips
In order to ensure IP66 waterproof level, please install the vandal dome according to the
instruction.
a. The Unused cable outlet hole must be closed, and the waterproof connector on the used hole
must be locked closely
b. We recommend the bottom of housing be set on the smooth flat and closely seal with the
surface.
c. When you mount the camera housing on the ceiling or wall, please use the screws with the
black rubber o-rings. Without the o-ring, the water may seep into the machine.
d. Turn and loose the control stick, shift right and left to adjust the vari-focal lens until the image
becomes clear, then turn and tighten the stick to fix it.