Description: This is a wireless communication module, integrated an NB-IOT M8321 module that released by China Mo bile, 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. In telecommunication, Long-Term Evo lution (LTE) is a standard for wireless broadband communication for mo bile devices and data terminals, based on the GSM/EDGE and UMTS/HSPA technologies. It increases the capacity and speed using a different radio interface together with core network improvements. Product Features: Double Antenna Resolved Speaker on board(I2S) Power Input: 5V Serial Communication: Uart2 16/17 M8321 Tem: -40C ~ + 85C Frequency Band: LTE-TDD: B38/B39/B40/B41 LTE-FDD: B1/B3/B8 TD-SCDMA: B34/B39 WCDMA: B1/B8 GSM(MHz): 900/1800 Data Transmit: LTE speed: (Mbps) LTE-FDD 50(UL)/150(DL)LTE-TDD 50(UL)/100(DL) HSPA+ speed: (Mbps) 5.76(UL)/21.6(DL) TD-SCDMA speed: (Mbps) 2.2(UL)/2.8(DL) EDGE speed: (Kbps) 384(UL)/384(DL) GPRS speed: (Kbps) 85.6(UL)/85.6(DL) SMS supported PDU/TEXT mode Netw