TP-Link TL-WA501G User Manual page 36

Disable short preamble - Disable short preamble and use long preamble only. 802.11b
mode supports only long preamble and this parameter will be ignored.
RTS threshold - RTS/CTS Threshold, the packet size that is used to determine if RTS/CTS
should be sent.
Fragmentation threshold - The maximum packet size used for fragmentation.
Beacon Interval - The interval time between two successive beacons.
Power - The transmit power of the access point.
Note:
Limited by local law regulations, version for North America does not have power selection option.
The wireless advanced settings for this version are shown below.
TL-WA501G
Figure 3-19 AP Wireless Advanced Settings
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54M Wireless Access Point User Guide