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 an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging.

Multiprotocol BLE/ANT/2.4 GHz/802.15.4 Cortex-M4F SoC, nRF52840 module BLE ANT ZigBee Thread 802.15.4 nRF52840 nordic MDBT50Q Raytac?MDBT50Q*