Lenovo ThinkPad T420si (English) User Guide - Page 22
Left-side view, Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3 - thinkpad t420s microphone
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Left-side view Figure 3. ThinkPad T420s/T420si left-side view 1 Fan louvers (left) 3 Combo audio jack 5 Smart card slot 2 USB connector (left) 4 Media card reader slot or ExpressCard slot 1 Fan louvers (left) The internal fan and louvers enable air to circulate in the computer and cool the central processor. Note: To avoid impeding airflow, do not place any obstacle in front of the fan. 2 USB connector (left) The Universal Serial Bus connectors are used for connecting devices compatible with a USB interface, such as a printer or a digital camera. Note: Your computer is compatible with USB 1.1 and 2.0. 3 Combo audio jack To listen to the sound from your computer, connect a headphone or a headset that has a 3.5mm 4-pole plug, to the combo audio jack. Note: If you are using a headset with a function switch, for example, a headset for an iPhone® mobile digital device, do not press this switch while using the headset. If you press it, the headset microphone will be disabled, and the internal microphone will be enabled instead. Note: The combo audio jack does not support a conventional microphone. For more information about the audio devices supported by the combo audio jack of your computer and the audio jacks of ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 (170 W). See "Using audio features" on page 59. 6 User Guide