Reolink E1 Manual page 12

Install the Camera
Here is a guide on how to install the camera to the ceiling.
Step 1. Install the Mounting Plate.
Drilling two screw holes on the wall according to the mounting hole template.
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Insert the two plastic anchors into the holes in the wall.
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Secure the base unit in place by tightening the screws into the plastic anchors.
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Step 2. Attach the Camera.
Align the camera with the bracket, then turn the camera unit clockwise to lock it in
position.