NB-Fi Protocol is an open LPWAN protocol, which operates in unlicensed ISM radio band.
Using the NB-Fi Protocol in devices allows data transmission range of up to 10 km in dense urban conditions, and up to 30 km in rural areas with up to 10 years on battery power.
[2] NB-Fi Protocol employs a Narrow Band technology that enables communication using the Industrial, Scientific and Medical ISM radio band (and in other parts of sub-GHz license-free spectrum as well).
NB-Fi devices could be manufactured using widespread electronic components which could easily be manufactured or purchased in every particular country.
[4] The signal can also be used to easily cover large areas and to reach underground objects.