Lenovo IdeaPad U165 - Manual (Page 19)

Chapter 1. Getting to know your computer
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Kensington slot Attach a security lock (not supplied) here.
Note: For details, see “Attaching a security lock (not supplied)” on page 21.
RJ-45 port Connects to an Ethernet network.
Note: For details, see “Wired connection” on page 26.