Hook up the safety buckle, and screw the two screws to fix the power box.
CAS-4000B ceiling mount kit
Fix the iron tube to the cover of power box and complete assembly by tightening
the 2 holes on the iron tube with included wrench.
CAS-4000C corner mount kit
Combine two brackets, and use the spanner to fix the screw.
Turn the screw to tighten the brackets and power box.