Dell Studio 15 (1555, Early 2009) - Manual (Page 28)

26
Using Your Studio Laptop
7 IEEE 1394a connector — Connects to high‑speed serial multimedia devices, such as
digital video cameras.
8 Audio in/Microphone connector — Connects to a microphone or inputs signal for use
with audio programs.
9 Audio out/Headphone connectors (2) — Connect to a pair of headphones or sends audio
to a powered speaker or sound system.