There is no difference in function. But R90 is wired adapter and R100Pro is wireless adapter. R90 can support more older controller devices without Bluetooth, and wired connective is more stable than wireless.

The R90 has 10% dead zone, and all controllers connected to the R90 will add 10% dead zone. The official website has a special 0 dead zone firmware, which can be selected according to your own situation.

1: Connect the R90 to the controller with a USB cable, and then insert it into the USB port of the console;

2: The indicator of the controller will be always on, press the HOME button of the controller to connect successfully.

R90 does not support XBOX console, only supports XBOX controller.

PC, SWITCH, PS4, PS5 (On the PS5, only PS4 version games are supported)

No, the R90 does not support audio output.

After connecting, you need to press the home button again to connect successfully. If you still can’t control it, please check whether the cable you are using has a data transfer function.

“Because not all controllers have a touchpad, in the R90 solution, the touchpad uses button + joystick to simulate some touchpad gestures of the ps controller.
And because the joystick is used, if the joystick is occupied during this process, the simulation logic cannot proceed.
If you find that the touchpad fails to press down without moving the joystick, you can check whether the joystick is in a drifting state.”