The nRF52840-DK supports the standard Nordic tool-chain software using Keil, IAR, and GCC. This development kit also supports Bluetooth mesh and Zigbee. Program/debug options are available for Segger J-Link OB and external target boards. The Development Kit gives access to all I/O and interfaces via edge connectors and features four user-programmable LEDs and buttons. Designers can connect an NFC antenna to enable NFC tag functionality.