CRJ-700 What is this panel for and/or what does it do?

This is the Aerosoft CRJ-700 cockpit. What is this panel called, what is it for and/or what does it do?

Thanks!!!
Mike

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This is TCAS panel

Multiple functions.
1 RTU 2 - inhibits radio tune unit 1 or 2 in case one fails to allow cross tuning.
Atc sel - select which transponder is operating. Again in case one channel fails you have back up.
Right panel is separate unit which is back up RTU in case you primary 1 and 2 fails.

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And to add, the display with the digital numbers is the Radio COM and NAV panel where you tune the frequency for radio communication with ATC or VOR navigation.