Aposonic A-S0802R18 - Manual (Page 11)

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this button is used to start/stop the selected PTZ control mode.
16. (Split Windows) +/- Buttons ( )
In split-window display, press these buttons for next/previous split-window
display. In the others, press these buttons to change the contents.
17. LEDs
Indicators for POWER, HDD and Network access.
18. Remote I/R Sensor
Used to receive signal from I/R remote controller.
19. USB2.0 Connector
Connect to USB 2.0 compatible storage device, such as USB 2.0 disk
drive, DVD+RW, card reader, etc.
20. USB Mouse Connector
Connect to USB1.1 mouse before the DVR is power on.