The Telemecanique XS4P12PA370D is a cylindrical shielded inductive proximity sensor from the XS4 series, packing a 4mm sensing range into a 12mm M12 threaded body. It runs on anything from 12 VDC to 48 VDC, sourcing up to 200 mA through its PNP normally-open output. The visible green LED tells you the target is present and the output is pulled high, which saves digging a scope out of the truck on first power-up.
Shielded by design
The shielded (flush) sensing face lets this sensor sit flush with a metal bracket without false-triggering on bracket steel. That matters when you're cramming multiple sensors into a tool changer or a gripper jaw. Nickel-plated PPS body resists coolant and cutting fluids well enough for most machine-tool environments, and the IP65/IP67 rating means you can hose it down without pulling the connector.
Standard three-wire, M12 drop
Three wires (brown/blue/black) on a male M12 quick-disconnect — standard pinout that mates with a dozen off-the-shelf cordsets. The PNP sourcing output is the usual choice for PLC sinking inputs; if your card expects NPN or a push-pull signal, you'll need a converter or a different sensor. 200 mA load current covers most relay coils and logic inputs without a buffer.