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That's right. Just like Wifi and other radio comms have the ability to vary which specific frequency they make use of, the RF24 line and others give you the ability to choose the default channel. I think each of the available channels is about 100Hz away from each other. Here is the main web page by the author of pretty much the go-to library for the RF24 series of devices. One of the projects he has listed there (if I remember correctly) will go through all of the available channels and give you a psuedo-graphic representation of how much interference it is seeing on each channel in order to hep pick which channel to use so you aren't fighting it out with all of the devices your neighbors might be using with the various devices they have.