If you are going to record on a micro-sd card:
A micro-sd card
If you are going to record on a computer :
You will need to bring your own computer equipped with a DAW: Reaper, Ableton, LogicPro, Garage Band, Audition, Protools,...
You will also need to download the RØDECaster Pro Companion App and RØDECaster – ASIO