Reolink 4CH User Manual page 10

Connection Diagram
Step 3 : Connect to your network
Connect an Ethernet cable from the LAN port on the NVR to LAN port on your router.
Step 4 : Connect the Mouse
Connect the mouse to the USB port.
The USB Mouse
Left click: Selects an item or confirms a choice.
Right click: Opens the menu bar from the live viewing screen.
Returns one "step" from a submenu.
Opens a context menu in some settings screens.
The Scroll Wheel: Can be used to adjust the values of sliders
and scales when highlighted by the mouse.
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