This is a FESTO Type SMT-8-PS-K-LED-24 sensor.
Flat design for insertion in FESTO Air Cylinder groove.
A 3-wire solid state switch with LED indicator light.
Sensor  is used - has been tested - with 90 day Warranty.
Actual picture if item.
Price $20.00 ea. (3 available with 8 foot cord)
Price $18.00 ea. (1 available with 4 foot cord)
Price $15.00 ea. (2 available with 10 inch cord)