8BitDo - Wireless USB Adapter for Most Gaming Controllers - Brick Red

It only works with Bluetooth controllers so it will not work with the Xbox 360 controller which uses Microsoft only protocol. The adapter works with the following 8BitDo controllers and arcade sticks (excluding 2.4G controllers) Xbox Bluetooth® controller, DualShock 3, DualShock 4, DualShock 4 Pro Wiimote, Wii U Pro, Switch Joy-Cons, Switch Pro

Step 1 - Make Sure Your DUALSHOCK®4 is Properly Connected to Your PS4™ Follow these steps to below: Make sure that the PS4™ system and TV are turned on. The light should be white on the PS4™. Connect your DUALSHOCK®4 (micro USB port located on the back) to your PS4™ (USB port located on the front), using the USB cable that came with your PS4™. While the DUALSHOCK®4 and PS4™ are connected, press the PS button on the controller. You should hear a beep and the controller light should change from orange to white. This starts the pairing process. The light bar on the controller turns blue when properly paired. If the light bar is not blue or the PS button is not responsive: Try a different USB port on the PS4™ you may need to fully charge your controller. If that doesn’t work try a different USB cable. If that doesn’t work, try a different DUALSHOCK®4. If none of the above work, try resetting your DUALSHOCK®4 controller.

plug the usb adaptor in the back of your switch like you would a wired controller. Hold the sync button on the ps5 while you hold the botton on the usb device. they will both start flashing and sync up automatically. you cannot use special features like motion controls in splatoon, everything else works fine

One device per adapter so if you want to use a headset and a controller you would need two of these

From what I remember you can only connect one controller per red brick adapter. It should work fine with whatever other controllers your using on your switch.