Q-See QSW8209 - Manual (Page 5)

4. Installation
4-1. Setting up the Camera
1. Setup the camera in the desired location
2. Connect the camera to the adapter and then slide the power switch to the ON
position
Note:
--This camera can also use dry batteries as a power source by loading 4 AA
batteries into the battery compartment on the back of the camera with their
polarities in the correct position.
--The AC adapter will work instead of batteries after it is plugged in. If the