RC4Magic Series 2 and Series 3 IDs are 4 hexadecimal characters (0-9,A-F), starting with 3 or higher. Examples: 31ED, 40A2.
The three IDs are usually consecutive but are not required to be.
You will find your IDs either written by hand on the purple product label, or below the serial number on a printed label.
The same IDs should be marked on all pieces of the same system.