The Allen - Bradley 42MRU - 5200 is a photoelectric sensor. Here are its brief parameters:
Series: Photoswitch 5000
Technology: Polarized retroreflective
Light Source: Visible red LED (660 nm)
Sensing Distance: 50.8 mm to 6 m
Operating Modes: Light operate / dark operate (selectable)
Response Time: 2.5 ms
Mounting Style: Standard mounting
Weight: 0.25 lbs
Output: 100 mA
Voltage: 20 - 254 VAC/VDC
Standards: CCC, CE, CSA, CUL, KC, UL