The nrf52832_mdk board is a fully open-source, versatile single board development kit for Bluetooth® low energy, ANT and 2.4GHz proprietary applications using the nRF52832 SoC.

The kit gives access to 24 I/Os and interfaces via headers and has a RGB LED which is user-programmable. It also has a 2.4GHz chip antenna onboard which is quite convenient to develop IoT wireless applications.

See nRF52832-mdk website [2] for more information about the development board and nRF52832 website [1] for the official reference on the IC itself.