TP-Link TL-WN821N - NT WIRELESS N USB ADAPTERATHEROS2T2R 2.4GHZ 802.11G B ND RTL User Manual page 23

Note:
Select different Security
appropriate security option and configure the exact key as your need.
3. Edit the Advanced tab
This screen below allows you to make advanced configuration for the profile.
Power Save Mode - Please select the power save mode in the drop-down list.
Figure 3-5
Options, the configurations are different; you can select the
Figure 3-6
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TL-WN821N Wireless N USB Adapter