NETGEAR Nighthawk M6 5G Mobile Hotspot & AX3600 Dual-Band Wi-Fi Router (Unlocked) - Manual (Page 3)

FCC regulations restrict the operation of this device in the 5.925-7.125 GHz band to
indoor use only.
6 GHz is available only when the device is powered by AC adapter connected to AC
mains.
The device cannot be used outdoors on 6 GHz, as required by FCC/IC rules.
When using external antennas, their net gain (antenna + cable loss) must be less than
what is specified in Table 3 and Table 4 in LTE and 5GNR transmission specifications
on page 69 in Chapter 7, "Specifications" as required by FCC.
3
Nighthawk M6