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1 Battery
Use your computer with battery power whenever ac power is unavailable.
For details, refer to the instructions in “Power Manager” on page 36
.
2 SIM card slot
If your computer has a wireless WAN feature, it may require a SIM (Subscriber Identication Module) card to
establish a wireless WAN (Wide Area Network) connections. Depending on the country of delivery, the SIM
card may be already installed in the SIM card slot.
3 Docking connector
With a ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series
3, or ThinkPad Ultrabase Series 3, you can extend the computer capabilities when you are in your ofce
or at home.
4 Memory-upgrade slot
You can increase the amount of memory in your computer by installing a memory module in the memory
bay. Memory modules are available as options.
5 Built-in stereo speakers
The stereo speakers are built into your computer.
For details, refer to the instructions in “Volume and mute buttons” on page 52
.
ThinkPad X220 Tablet and X220i Tablet bottom view
Figure8. Bottom view
1 Battery
2 SIM card slot
3 Docking connector 4 Memory-upgrade slot
1 Battery
Use your computer with battery power whenever ac power is unavailable.
16 User Guide