How to choose which Wireless Receiver to pair to?

I have more than 2 wireless receivers (I flashed the Steam Controller dongle with the Steam VR Receiver firmware), but I don’t remember how I can decide what controller to pair to.

Can anyone help?

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Disonnect dongles, turn off controllers. Connect one dongle, turn on controller you want to pair it to. After pairing repeat for the second dongle and controller