This article explains how to determine which Elo/Zebra 2D Scanner you have

Currently Elo sells 2D Barcode Scanners integrated with Zebra's OEM scan engines. At the time of this writing, you can purchase scanners integrated with Zebra's: SE2707, SE4107, and SE4720 OEM scan engines. Below photos indicate how to distinguish which scanner you have.
 

Below shows side-by-side comparison between SE4107, SE4720, SE2707 scan engines offered in Elo 2D Barcode Scanners:  E245047 (SE4107), E384627 (SE4720), E393160 (SE2707)