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Check the listing for details. SIM800L GPRS transfer board micro SIM GSM Core board 4 frequency module TTL NEW. Condition: New. Listed at 3.50 USD. Module Model: SIM800L. TTL serial port. Module size: 2.5cmx2.3cm. SIM800 series modules support File Transfer Protocol application. Which provides a mode to interact with FTP server. SIM800 series modules support Hyper Text Transfer Protocol application.