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An indicator to the left of the connector shows the status of ac power. When the ac power adapter is
connected, the indicator is on. If a battery is installed in the computer, the indicator is green when the
battery charges.
DANGER
To avoid the risk of electrical shock, do not connect the telephone cable to the Ethernet connector.
You can only connect an Ethernet cable to this connector.
6 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.
Notes:
• 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.
• The combo audio jack does not support a conventional microphone. For more information about the
audio devices supported by the combo audio jack, see “Using audio features” on page 45.
Bottom view
Figure 4. ThinkPad X121e bottom view
1 Battery
2 SIM card slot
3 Memory slot 4 WWAN card slot
5 WLAN card slot 6 Hard disk drive or solid state drive slot
1 Battery
Use your computer with battery power whenever ac power is unavailable.
You can use Power Manager to adjust your power setting as needed. For details, refer to the instructions in
“Power Manager” on page 19
.
Chapter 1. Product Overview 7