Lenovo ThinkPad X220i (English) User Guide - Page 32
ThinkPad X220 Tablet and X220i Tablet bottom view, With a ThinkPad Port Replicator Series 3
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1 Battery Use your computer with battery power whenever ac power is unavailable. By installing a second battery, available as an option, in the n the serial Ultrabay slim, you can extend the operating time of the computer. You can also use Power Manager to adjust your power setting as needed. 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 Identification 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 X220 Ultrabase, you can extend the computer capabilities when you are in your office 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 Figure 8. Bottom view 1 Battery 3 Docking connector 16 User Guide 2 SIM card slot 4 Memory-upgrade slot