Lenovo ThinkPad Edge E520 (English) User Guide - Page 27
Bottom view - memory
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Bottom view Figure 5. ThinkPad Edge E420 and E520 bottom view 1 Battery 3 PCI Express Mini Card slot for wireless WAN 5 Hard disk drive 2 SIM card slot 4 Memory-upgrade slot 6 PCI Express Mini Card slot for wireless LAN/WiMAX 1 Battery Use your computer with battery power whenever ac power is unavailable. By installing an extended life battery available as an option 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 23. 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 PCI Express Mini Card slot for wireless WAN Your computer might include a PCI Express Mini Card for wireless WAN in the PCI Express Mini Card slot which enables wireless WAN communications. 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. Chapter 1. Product Overview 9