Looks like it's connected to an external dongle or USB style spectrum analyzer. Whatever works for you personally is fine. I am using a hardware Spectrum Analyzer with it's own display and the option to connect to an external application for cleaner screenshots. No external software is needed to use my unit (RF Explorer 6G) but it will produce better screenshots if you have the software. My configuration is just different so go with what you feel comfortable with. In this case, you are polling your data from the USB stick or dongle, if I am understanding the photo correctly, so you aren't limited to the smartphones' radio's capability. So whatever I said about the frequency limitations would not apply to your config. Yours would be limited to whatever the USB stick Spectrum Analyzer (?) is spec'd out for. I'm just guessing based on the frequency you are scanning (433MHz) which in the US, typically isn't used by commercial wireless providers and not usually capable of being passed by the smartphones radios. I have seen that frequency in other circles though. I think it's used for radio control drones and car remotes in addition to other things, assuming you are based in the US.