Asus USB-N13 - Manual (Page 53)

Site Monitor main window
The Site Monitor main window displays the available wireless connections and the
signal-to-noise (SNR) value of a selected connection.
NOTE: Some Access Points disable their SSID broadcasting to hide
themselves from “Site Survey” or “Site Monitor”. You may join these APs
if you know their SSID.
ASUS Network adapter 3
Chapter 3 - Software Reference
Chapter 3
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