Good day. Thank you for your question.
Our devices are named according to the technology it uses so in general,
FMU – 3G (UMTS), 2G fallback, GNSS, Bluetooth trackers
FMC – 4G LTE (CAT1), 3G/2G fallback, GNSS, Bluetooth trackers
FMM – 4G LTE (CAT M1), NB-IoT, 2G fallback, GNSS, Bluetooth trackers
So for the list of current products, you may refer here https://teltonika-gps.com/products/
Please go through this and let me know if it helps.