You must have at least one set of BLE Nano Kit v2 because you will need the companion board, DAPLink v1.5 board, which is used to load firmware into BLE Nano 2 from a PC.**Headers not soldered on, two 16-pin male headers are included in the package. We have another model that comes with the header soldered on.
Nano 2 (with header)
BLE Nano 2 is the smallest Bluetooth Low Energy System-on-Chip (SoC) development board, only 18.5 x 21mm. You could develop application using Nordic's SDK, mbed.org or our open source Arduino Library for nRF5x.