Dahua Technology DH-IPC-HDEW Series Quick Start Manual page 26

Step 2 Use 3 M6×14 inner hexagon screws and nuts to fix the universal joint on the bracket.
Step 3 Connect the cables among the Camera, bracket, flexible tube, and control cabinet.
Figure 3-5 Install the wall mount bracket
Figure 3-6 Install the universal joint
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Quick Start Guide