Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE)Introducing the Adafruit Bluefruit LE SPI Friend a powerful and easy to use Bluetooth Low Energy (BLE) module designed to bring wireless connectivity to your robot, art, or electronics project! With BLE support now standard on most smartphones and tablets, its never been easier to add wireless features to your creations. This compact module connects to your Arduino or microcontroller using a simple four pin SPI interface (MISO, MOSI, SCK, and CS),