The HD67084-B2-xxxMHz are M-Bus Wireless / Ethernet converters.

They allow to monitor some M-Bus Wireless meters (like Engelmann, Amber-Wireless, Maddalena, Siemens, exc. meters) with an Ethernet net.
They are completely transparent converters and the data of the M-Bus Wireless meters are sent over Ethernet using TCP or UDP.

They can use 169 MHz, 433 MHz or 868 MHz frequency on M-Bus Wireless side and they support N1 and N2 (169 MHz) or S1 and T1 (433 & 868 MHz) communication.

On M-Bus Wireless side, the HD67084-B2 can manage up to 32 meters.