Datavideo PTC-140NDIW Instruction Manual page 36

Step 2: Mount the bracket's upper plate to the ceiling
Insert the four PA4 plastic screw stoppers into the ceiling as shown in the diagram
below.
Using four PA4*30 self-tapping screws, affix the bracket's upper plate to the
ceiling.
Upper Plate of Ceiling Bracket
Step 3: Affix the bracket's lower plate to the bottom of PTC-140NDI
As depicted in the diagram below, use three PM3*5 screws to affix the bracket's
lower plate to the bottom of PTC-140NDI.
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