Insert the USB-C RX into the phone, then press and hold the button for 3 seconds to enter pairing mode. (blue light flashes rapidly)

With the TX turned off, press and hold the power button for 6 seconds to enter pairing mode. (blue light flashes rapidly)

When both the USB-C RX and TX indicators are solid blue or solid green, pairing is complete. (If pairing fails within 60 seconds, the devices will automatically exit pairing mode)