The SICK GTB10-P4211 is a photoelectric proximity sensor from the G10 series, with a PNP output and a 950 mm sensing range using a PinPoint LED visible red light source. It switches in 500 µs, covers 20 mm to 950 mm, and handles loads up to 100 mA at 10–30 VDC. That 500 µs response time keeps up with fast-moving parts on a conveyor — no missed counts from a slow sensor.
The housing is 20 mm wide and 50 mm tall, which wires up clean on a DIN rail or bracket in a panel. M12 4-pin connector keeps the wiring simple — no pigtail to dress. IP67 means it handles washdown and dust without a second thought, so it's right at home on a packaging or bottling line where hoses come out at shift end.