TRENDnet TEW-671BR - Manual (Page 15)

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4.3. WLAN Setups
We recommend you setting up the wireless encryptions immediately to protect your network.
To change security levels, please point to the bars, you can extend the security by clicking
next to the existing bar.
Security options from Lowest security with no encryption, WEP (Open) then Medium security
WEP (Shared Key), and High security WPA-PSK, and last Highest security WPA2-PSK.