Adafruit Feather is a complete product line of development boards that can be operated both stand-alone and stackable. They can be powered on the road by LiPo batteries or stationary via their Micro-USB connectors. Feathers are flexible, portable and as light as a feather as their name suggests.
The Adafruit Feather nRF52 Bluefruit is another easy-to-use all-in-one Bluetooth low energy Bluetooth board with a native Bluetooth chip, the nRF52832! It is the approach for an all-in-one Arduino compatible Bluetooth Low Energy with integrated USB and battery charging.
