Asus B53V - Manual (Page 28)

Headphone Output Jack
The stereo headphone jack (1/8 inch) is used to connect
the Notebook PC’s audio out signal to amplified speakers
or headphones. Using this jack automatically disables the
built-in speakers.
SPDIF Output Jack
This jack provides connection to SPDIF (Sony/Philips Digital
Interface) compliant devices for digital audio output. Use
this feature to turn the Notebook PC into a hi-fi home
entertainment system.
E-SATA
E-SATA Port & USB Combo Port
ExpressCard Slot
Comb
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