Taiss Photoelectric Beam Sensor E3JK-R4M1 Indoor Wall Mounted 12-240VDC 24-240VAC Retroreflective photoelectric Sensor Switch Proximity Switch 2M Cable Induction 3M

It works really well - paired with a 12v DC LED light to indicate when a door is open. The instructions are almost useless so be very careful & methodical when installing. The polarity doesn’t matter for power to the sensor - polarity DOES matter for the switch AND (I found) for the LED light I connected it to. Also, because I’m working in short distances for the indicator I found it works better without the supplied reflector, which was too good for what I wanted; a strip of reflective tape does the job so the light goes on when the door is fully open & goes off as it closes. It took a number of tries to figure out the connections (a review I read said polarity didn’t matter) but now it’s working it does exactly what I wanted.

I made my own automatic chicken coop door and used this for the close cycle to prevent chickens from getting a guillotine situation. This has work great, super easy. Don’t need the instructions, the wiring info you need is printed right on the product showing you what wire color goes to what. If you understand some basic electrical wiring you will be fine.

Product worked as advertised out to 4 meters. Product description did not clearly show the limitation, my requirement was 5 meters (the width of a double garage door). Very frustrating. You should consider offering a 5 meter version and insure the product description clearly shows detection range.

Aimed the sensor towards a garage door to turn a light on when opened. It does the job. Only wish it would handle a higher amperage.

Works good and as advertised. Satisfied and recommend.