NCC in Taiwan has published final technical specifications for Narrowband Terminal Equipment (dated 10 January 2018).
The specification covers LTE-M1 terminal equipment using Frequency Division Duplex (FDD) bands at 700MHz, 900MHz, 1800MHz, 2100MHz, 2500MHz and 2600MHz; and Time Division Duplex (TDD) in bands 2500MHz and 2600MHz. It also covers NB-IoT terminal equipment using FDD bands at 700MHz, 900MHz, 1800MHz and 2100MHz.