Asus A4320 Series User Manual page 17

Headphone jack
This stereo headphone jack (3.5mm) is used to connect
the system's audio out signal to headphones. Using this
jack automatically disables the built-in speakers.
Microphone jack
The microphone jack is designed to connect to a
microphone used for video conferencing, voice
narrations, or simple audio recordings.
Optical disc drive
Your ASUS All-in-One PC's optical drive may support
several disc formats such as CDs, DVDs, recordable discs,
or rewritable discs.
Smart Card Slot
This ASUS All-in-One PC has a built-in smart card reader
that can conveniently read data from and write data to a
smart card.
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ASUS All-in-One PC