How does Auto registration work?
Press and hold the device selection button for 5 seconds until the red LED is on, point the remote at your device, then press and release OK to start searching. A different infrared signal is sent every 2 seconds (indicated by a blue flash), and when your device turns off, immediately press and release OK to save the code within the maximum 20-minute window. The blue LED indicator will turn off when the code is saved.
From the official Philips Universal Remote Control manual, page 6
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