Unlicensed National Information Infrastructure. The Unlicensed National Information Infrastructure (UNII) bands have three groupings, with different frequency ranges, maximum transmit power, and permitted transmission areas.
Band
Frequency
Area
UNII-1
5.155.25 GHz
Outdoor use only
UNII-2
5.255.35 GHz
Indoor and outdoor use
UNII-3
5.7257.825 GHz
Indoor and outdoor use
user
In the context of this book, a person who uses a wireless client.
