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The TRB256 from Teltonika is a reliable industrial 4G LTE NB-IoT gateway that is suitable for many IoT solutions. It comes with various WAN interfaces, including I/Os, RS232, RS485, and Ethernet port, along with dual SIM capabilities for uninterrupted connectivity. This gateway also supports the 450 MHz frequency band, providing excellent LTE signal penetration, and making it ideal for a wide range of M2M applications.