🧰SDCard (128Mb) and DFPlayer Mini are included in the kit.
Take an SD card (different from the one you are using for RPi), format as FAT, copy MP3 files to the root folder. Insert SD card to DFPlayer. Insert DFPlayer into motherboard SD card facing right (towards RPi)
The Kit includes 2 wheel xESCs and 1 mower motor xESC, configured and ready to go. They are identical in hardware, only XML configs differ.
Configuring xESCs is beyond the scope of this doc.