config PI433 tristate "Pi433 - a 433MHz radio module for Raspberry Pi" depends on SPI help This option allows you to enable support for the radio module Pi433. Pi433 is a shield that fits onto the GPIO header of a Raspberry Pi or compatible. It extends the Raspberry Pi with the option, to send and receive data in the 433MHz ISM band - for example to communicate between two systems without using ethernet or bluetooth or for control or read sockets, actors, sensors, widely available for low price. For details or the option to buy, please visit https://pi433.de/en.html If in doubt, say N here, but saying yes most probably won't hurt