HP ProBook 6455b Maintenance And Service Manual page 35

Item Component
(2) DisplayPort
(3) USB ports (3)
(4) Smart Card Reader (select models only)
(5) Audio-in (microphone) jack
(6) Audio-out (headphone) jack
28 Chapter 2 External component identification
Description
Connects an optional digital display device such as a
high-performance monitor or projector.
Connect optional USB devices.
Supports optional smart cards and Java™ Cards.
Connects an optional computer headset microphone,
stereo array microphone, or monaural microphone.
Produces sound when connected to optional powered
stereo speakers, headphones, ear buds, a headset, or
television audio.
NOTE: When a device is connected to the headphone
jack, the computer speakers are disabled.