Aposonic A-S1602R25 - Manual (Page 11)

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16. LEDs
Indicators for POWER, HDD and Network access.
17. Remote I/R Sensor
Used to receive signal from I/R remote controller.
18. USB2.0 Connector
Connect to USB2.0 compatible device, such as USB 2.0 disk drive,
DVD+RW, USB 3G dongle, etc.
19. Alpha-numeric Buttons (1-4/8)
Press these buttons for camera selection in most of the circumstances.
These buttons can also be used to enter text and number in the way
similar to most of the mobile phones.