Cerio OW-200N2 User Manual page 106

There are a maximum of 20 clients allowed in this "Enable" List. The MAC
addresses of the wireless clients can be added and removed to the list using the
Add and Remove buttons.
Click Reboot button to activate your changes.
Notice: MAC Access Control is the weakest security approach.WPA or WPA2
security method is highly recommended.
500mW eXtreme Power 11Na Outdoor Bridge
106
User's Manual