Photoelectric Switch control by infraredray, as a apporach sensor, includeing a transmitter and receiver in it.
A retroreflective arrangement places the transmitter and receiver at the same location and uses a reflector to bounce the light beam back from the transmitter to the receiver.
An object is sensed when the beam is interrupted and fails to reach the receiver.

◐Product Name : Photoelectric Switch
◐Model : E3JK-R4M2
◐Type : DC 5-wire
◐Detection Distance : 4m
◐Work Voltage : DC 12-24V
◐Relay Output : AC 250V 3A (Max)

◐Ambient Temperature : Operating:-20 - 55 ℃
◐Storage:-30 - 70 ℃
◐Response Time : ◐Directional Angle : Sensor:1 - 5 ℃
◐Reflector: 40 ℃( Min.)

◐Size : 50 x 50 x 18mm /2" x 2" x 0.7" (L*W*H)
◐Reflector Panel Size : 61 x 51 x 7.5mm/2.4'' x 2'' x 0.3'' (L*W*T)
◐Cable Length : 125cm/ 49.2"

◐Weight : 155g
◐Indicator Light Color : Red
◐Material : Plastic, Metal
Color : Black, Gray

Package Content : 1 x Photoelectric Switch;1 x Reflector Panel;1 x Mounting Bracket(with screws,nut)

Can be applied in security system, manufacturing industry.US users need to buy another voltage transformer(not included here.)