The Radial Catapult Mini RX is set up to receiver four balanced audio signals via a Cat 5 port, then send them out over four XLR plugs.
The Radial Catapult Mini TX comes equipped with four balanced XLR plugs and prepares the four incoming signals to be sent on via the fitted Cat 5 port.
The Radial Catapult Mini TRS is the version of this series with 4 balanced jack TRS connectors. The signal from these four connectors is then converted to CAT5.