Depending on the DJI model and settings, it will auto select a channel either in the 2 MHz range or 5 MHz range, and while in flight switch channels as the WiFi signal strength changes in flight.
It is an original Mavic Pro 1. I was not flying in WI-FI mode. In the manual, I found where it says the remote controller's operating frequency is 2.4Ghz - 2.4835 Ghz. I have emailed the manufacturer of the smart water meter to see what it's frequency is...but I found this via google:
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What frequency does a smart meter use?2.4 GHz
Inside the home, Smart Meters usually use wireless signals at 2.4 GHz, with a maximum power of less than 1 W. This is a similar frequency to several existing wireless technologies - WiFi, Bluetooth and ZigBee for example. Some Smart Meters use the actual ZigBee system, and powers may be significantly less than 1 W.