Retroid Official Dock Compatibility List:

RP4 Pro(D1100) : Full compatibility

RP4(D900): Partial compatibility (No HDMI support)

RP3+ : Partial compatibility*

RP3: Charge only

RP2/2S/2+: Not applicable

*Application Limitations for RP3+ Owners:

  1. For RP3+, the 2 USB3.0 ports will become USB2.0.
  2. When RP3+ is docked and if you want to use any of the 4 usb ports or ethernet, DO NOT apply any external power to the dock which can be powered by the battery of RP3+
  3. When external power is applied to the dock, the 4 usb ports or ethernet will lose its functionality. In this mode, the dock can only have charging function for RP3+