Datavideo PTC-285W Instruction Manual page 11

USB Port
This USB port is used for updating firmware. Users can save the latest
version of firmware in a USB flash drive and then insert it into this
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interface for firmware updating.
Note: After inserting the USB flash drive, please remember to turn "ON"
the SETUP->USB UPGRADE from the OSD menu of the PTC-285 camera.
Power Input
DC in socket connects the supplied 12V PSU. The connection can be
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secured by screwing the outer fastening ring of the DC In plug to the
socket.
Rear of Camera
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