Dell 1526 - Inspiron - Laptop Owner's Manual page 24

Turns on when the numeric keypad is enabled.
9
Turns on when the uppercase letter (caps lock) function is enabled.
A
Turns on when the scroll lock function is enabled.
D I G I T A L A R R A Y M I C R O P H O N E S
NOTE:
Digital array microphones are optional and may not be present in your
computer unless you have ordered for the optional camera. Instead, your computer
will have an integrated single analog microphone.
24
About Your Computer
— Built-in microphone for conferencing and chat.