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Amazon.com: Dual-Band 3G Modem with Maestro M100 Sierra SL808X Module RS232 Mini USB Interface TCP/IP SMS : Electronics
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Industrial IOT 4G GSM Modem with RS232 RS485 (USR-G786)
Industry Modem (3G) USB, RS232 | Singapore IOT, M2M, Modem, RTU, SMS Gateway, Whatsapp Business Platform