Dell Studio 1749 (Early 2010) - Manual (Page 29)

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Using Your Studio Laptop
8 ExpressCard slot — Provides support for additional memory, wired and wireless
communications, multimedia, and security features. The slot supports 34 mm ExpressCards.
NOTE: The ExpressCard slot is designed only for ExpressCards. It does NOT support PC cards.
NOTE: Your computer ships with a plastic blank installed in the ExpressCard slot. Blanks
protect unused slots from dust and other particles. Save the blank for use when no
ExpressCard is installed in the slot; blanks from other computers may not fit your computer.
9 Audio in/Microphone connector — Connects to a microphone or inputs signal for use
with audio programs.
10 Audio out/Headphone connectors (2) — Connect one or two pairs of headphones, or
sends audio to a powered speaker or sound system. The audio signal is the same for both
connectors.