Remain holding button 2 and 3 for more than 2 seconds, the LED flashes in red (or blue), the duplicator is ready to copy another remote control ; repeat holding button 2 and 3, the LED flashes in blue( or red), the duplicator returns to the previous remote control. In a word, use button 2+3 to switch between two remote controls you copied or want to copy. According to the LED color, red or blue, you can distinguish the remote controls copied easily.
Fixed code remote control:
Rolling code remote control:

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