BBC micro:bit v1

Dev Board
BBC micro:bit v1

Pocket-sized educational microcontroller with nRF51822, 5×5 LED matrix, accelerometer, magnetometer, Bluetooth LE, 2 buttons, and 19 I/O pins. Designed for teaching coding to children and beginners vi

Nordic nRF51822 ARM Cortex-M016 KB256 KBBLE Bluetooth 4.0 LE
~$15View

Adafruit Feather 32u4 Bluefruit LE

Dev Board
Adafruit Feather 32u4 Bluefruit LE

Feather-format ATmega32u4 board with integrated nRF51822 Bluetooth LE, LiPo charging, native USB, 20 GPIO, and over-the-air firmware updates — an all-in-one BLE development board for iOS and Android c

ATmega32u4 @ 8 MHz2 KB32 KBBLE Bluetooth LE 4.1 (nRF51822)
~$30View

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More to explore — popular traits shared by devices with Components: nRF51822.