What this sensor is and what it signals
The E3FA-DP25: It sits in Omron's E3FA family, a cylindrical-body photoelectric line common in packaging lines, conveyor gates, and part-presence detection where you need a visible spot for quick setup.
Output type and supply — what the listing doesn't say
The E3FA series includes both NPN and PNP variants, but the DP25 suffix alone does not encode the output polarity — verify the full part number against your existing sensor's nameplate or the machine schematic.