The E840-TTL-4G05 is a wireless communication data transmission module with diversity reception function, supporting LTE-FDD, LTE-TDD, DC-HSDPA, HSPA+, HSDPA, HSUPA, WCDMA, TD-SCDMA, CDMA, EDGE and GPRS network data connection. Through simple AT instruction settings, this product can be used to easily realize the bidirectional data transparent transmission from serial port to network.