HP 4340S manual Front, To the HP Notebook Reference Guide

Component		Description
(6)	Windows applications key	Displays a shortcut menu for items beneath the cursor.
(7)	num lk key	Turns the embedded numeric keypad on and off when
		pressed in combination with the fn key.

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Component		Description
(1)	Drive light	● White: The hard drive is being accessed.
		● Amber: HP 3D DriveGuard has temporarily parked the
			hard drive.
			NOTE: For information on HP 3D DriveGuard, refer
			to the HP Notebook Reference Guide.
(2)	Media Card Reader	Supports the following digital card formats:
		●	Memory Stick PRO
		● Memory Stick PRO Duo (needs an adapter)
		●	MultiMediaCard (MMC)
		●	MultiMediaCardplus (MMC+)
		● Secure Digital (SD) Card
		● Secure Digital High Capacity (SDHC) Card
		● Secure Digital Extra Capacity (SDXC) Card
(3)	Audio-out (headphone) jack	Connects optional powered stereo speakers, headphones,
		earbuds, a headset, or a television audio cable.
		WARNING! To reduce the risk of personal injury, adjust
		the volume before putting on headphones, earbuds, or a
		headset. For additional safety information, refer to the
		Regulatory, Safety, and Environmental Notices
		NOTE: When a device is connected to the jack, the
		computer speakers are disabled.
(4)	Audio-in (microphone) jack	Connects an optional computer headset microphone, stereo
		array microphone, or monaural microphone.

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