Lenovo ThinkPad X131e (English) User Guide - Page 22
Status indicators
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You can use the Power Manager program to adjust your power settings as needed. For details, see the help information system of the Power Manager program. 2 SIM card slot If your computer has a wireless WAN feature, it might require a Subscriber Identification Module (SIM ) card to establish a wireless Wide Area Network (WAN ) connection. Depending on the country of delivery, the SIM card might already be installed in the SIM card slot. 3 Memory-upgrade slot You can increase the amount of memory in your computer by installing a memory module in the memory-upgrade slot. Memory modules are available as options from Lenovo. 4 PCI Express Mini Card slot for wireless WAN card Your computer might have a (WAN) card installed in the PCI Express Mini Card slot for wireless WAN connections. 5 PCI Express Mini Card slot for wireless LAN or WiMAX card Your computer includes a wireless local area network (LAN) card or Worldwide Interoperability for Microwave Access (WiMAX) card in the PCI Express Mini Card slot for you to establish wireless LAN or WiMAX connections. 6 Hard disk drive or solid state drive Depending on models, your computer might have a large-capacity, customer-upgradable hard disk drive that can meet a variety of storage demands. Some models are equipped with a solid state drive for data storage, making your computer lighter, smaller, and faster. Note: The hidden service partition is the reason why there is less free space than expected on your hard disk drive or solid state drive. This reduction is more noticeable on the solid state drive because of its smaller capacity. Status indicators The status indicators show the current status of your computer. System status indicators The illuminated dot in the ThinkPad logo on the outer lid of your computer and on the palm rest works as a system status indicator. 6 User Guide