Draytek VigorAP 800 User Manual page 53

Enable Wireless LAN Check the box to enable wireless function.
Mode
Channel
At present, VigorAP 800 can connect to 11 b only, 11 g only, 11
n only, Mixed (11b+11g) and Mixed (11b+11g+11n) stations
simultaneously. Simply choose Mixed (11b+11g+11n) mode.
Means the channel of frequency of the wireless LAN. The default
channel is 11. You may switch channel if the selected channel is
under serious interference. If you have no idea of choosing the
frequency, please select AutoSelect to let system determine for
you.
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VigorAP 800 User's Guide