Lenovo ThinkPad W540 (English) User Guide - Page 22
Bottom view, stations, see ThinkPad docking stations
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• The audio connector does not support a conventional microphone. For more information, see "Using audio features" on page 38. Bottom view Figure 4. Bottom view 1 Battery pack 2 SIM card slot 3 Docking station connector 4 Keyboard drainage holes 5 Speakers 1 Battery pack Use the computer with battery power whenever ac power is unavailable. You can use the Power Manager program to adjust your power settings as needed. For detailed information, see the help information system of the Power Manager program. 2 SIM card slot If your computer supports the wireless wide area network (WAN) feature, a Subscriber Identification Module (SIM) card might be required to establish wireless WAN connections. Depending on the country or region of delivery, the SIM card might be already installed in the SIM card slot. For more information, see "Installing or replacing the SIM card" on page 71. 3 Docking station connector You can use the connector to connect the computer to a supported docking station to extend the computer capabilities when you are at the office or at home. For more information about the supported docking stations, see "ThinkPad docking stations" on page 95. 4 Keyboard drainage holes The keyboard drainage holes can help drain out liquid from your computer if you accidentally spill water or drink over the keyboard. 5 Speakers Your computer is equipped with a pair of stereo speakers. 6 User Guide