It is very small, only 1 square meter. Inch probably can't handle much current but has good isolation, could be good for switching between oscillators or antennas on an SDR receiver etc. Couldn't find anything that would say what to power it but seems to work fine with 12v and requires 5v to switch between ports. It is bi-directional, each port can be input or output. In testing it had about 2dB of insertion loss and 50dB of isolation, not the 60dB they claim.
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