These two Short Female Headers alone are, well, lonely. But pair them with any Adafruit Feather boards and you're in business! These headers are particularly cute and tiny with a body height of just 5.0 mm they are the best way...

The Adafruit Feather nRF52 Bluefruit is another easy-to-use all-in-one Bluetooth Low Energy board, with a native-Bluetooth chip, the nRF52832! It's Adafruit's take on an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built-in USB...