https://www.adafruit.com/product/3406
Adafruit Feather nRF52 Bluefruit LE [nRF52832] : Adafruit Industries, Unique & fun DIY electronics...
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 our take...
adafruitfeatherlenrf52832industries
https://www.adafruit.com/product/3574
Adafruit Feather nRF52 Pro with myNewt Bootloader [nRF52832] : Adafruit Industries, Unique & fun...
The Adafruit Feather nRF52 Pro is another Bluetooth® Low Energy board for advanced projects and users who want to use a fully open-source Bluetooth® Low Energy...
adafruitfeatherprobootloadernrf52832