The Nordic Semiconductor Bluetooth Development Kit has access to all I/Os and interfaces via connectors and there are an integrated PCB trace antenna and an RFconnector for direct RF test measurements. There is also a connector for an external NFC antenna. The kit is compatible with the Arduino Uno Rev3 standard making it possible to use a wide range of 3rd-party shields during development. It comes with an on-board SEGGER J-Link debugger allowing programming and debugging both the onboard SoC and external SoCs through the debug out the header.

3rd party shields
4 x user-programmable buttons
4 x user-programmable LEDs
Affordable, single-board development kit for the nRF52811 and nRF52840 SoCs
All I/Os (48) and interfaces available via connectors
Arduino Rev3 compatible connector for use with
Arm CryptoCell CC310 cryptographic accelerator
Bluetooth 5 multiprotocoll radio
Coin-cell battery holder
Connector for external NFC antenna
DSP instruction set
External memory on-board
Integrated 2.4 GHz PCB antenna
NFC antenna
Pins for power consumption measurements
Segger J-Link OB programming/debugging supported
Support for programming/debugging of external boards
SWF RF connector for direct RF measurements
USB interface direct to nRF52840 SoC
USB interface to power and program/debug
Voltage of 1.7V and 5.5 V supplied from a battery, external or USB

IoT
Advanced personal fitness devices
Advanced remote controls
Advanced wearables
Connected Health
Gaming controllers
Interactive entertainment devices
Virtual/Augmented Reality applications

IEEE 802.15.4