Based on nRF52840 (E73-2G4M08S1C).
Compatible with pca10059 (Dongle) Board.
Can be used in the development of Zigbee devices. (Sniffer, Coordinator, Router, End device).
Also can be used as a cheap version of the arduino nano 33 ble.
And of course the device can be used as a node MySensors!
A great device for learning nRF52.
GitHub - https://github.com/smartboxchannel/EFEKTA-nRF52840-MINI-DEV-BOARD (links, gerber, cod, bom, foto)
...I hope this development will deserve your like