This is a wireless communication module, integrated M8321 module that released by China Mobile, provided TD-LTE/FDD-LTE/WCDMA/TD- SCDMA/GSM/GPRS/EDGE Frequency Band and LCC+LGA package type. It has integrated plentiful Internet protocols, field standard interface, and functions, supported WindowsXP,Windows7,Windows8,Windows10,Linux and Android USB driver. In the LTE-4G module scheme, we added more hardware resources, 1 reserved speaker solder panel, 3 LEDs, exported USB interface, double antennea allowed. M8321 is 4V power input, so in the hardware of LTE-4G module, we added a Bidirectional Voltage-Level Translator (TXS0104E), to switch the power supply to 4V.
This product covers B1/3/8 of FDD-LTE. So, it may work in Japan properly.
Technically, it's no problem. How about the approval of ARIB ?
M5Stack LTE Module (M8321)