Acer 3600 Series manual Microphone-in jack front see note

15

Label	Icon	Component
11		Microphone-in jack (front) see note
12		Headphone-out port
13		Hard disk activity LED
14		LAN activity LED
15		Power LED
16		Power button

Note: The system has two microphone-in jacks (front and rear). However, you can not use both of them at the same time. By default, your system enables the microphone-in jack in front and disables the one at the back.