What it is and the rating that decides fit
Omron E3JM-DS70M4-US photoelectric sensor with relay output rated 240 VDC and sensing distance 2.3 ft.
What this sensor is for
Typical applications for this class include part detection on conveyors, pallet presence, or material-edge sensing in packaging lines. The relay output means it can switch medium-current DC loads (up to the relay's rating) — useful for direct control of small motors or valves without an extra interface relay.