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Adafruit Bluefruit LE SPI Friend Bluetooth Module Features Bluetooth modules are a type of wireless communication modules that can be added to a project through the serial or SPI communication protocols.The advantage of using Bluetooth modules is that they are easy to set up and use.The Adafruit Bluefruit  BL SPI Friend module supports SPI communication.This module makes it easy to add Bluetooth to any board. Using SPI communication protocol, you no longer have to worry about speed (baud rate), ...