Acer Veriton 6900Pro - Manual (Page 97)

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1. This device may not cause interference, and
2. This device must accept any interference, including interference
that may cause undesired operation of the device.
b Operation in 2.4 GHz band
To prevent radio interference to the licensed service, this device is
intended to be operated indoors and installation outdoors is subject
to licensing.
c Operation in 5 GHz band