What is the slot under the battery

Just got my new T400 yesterday and was very excited about it.

have a question here.  I noticed a place where the mental battery seven pines touch laptop, in virtue of this place, there is a small plastic film with a similar size to a micro-sd card card. He's also a figure resembles a card SD (rectangle with a corner cut). If I pull the plastic film, the card can also be removed, but the film remains in.

I don't find it anywhere in the manual. What is this site supposed to do? I guess that is not the SD card reader, because it's on the left side of the laptop, not hide under the battery does.

Thank you.

I think that it is the location for SIM card for the machine with system WWAN. If you do not have the WWAN, it's just a dummy slot that does nothing.

Tags: ThinkPad Notebooks

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