Could you please provide instructions about wiring and usage?

There is an attached wiring diagram on the switch connecting wire.This product is widely used in outdoors gates, garage doors, Weatherproof (IP66) construction for indoor/outdoor usage etc. Supply Voltage:6-36V DC;Type : NPN（normally open ）;Wire Type : DC 3 Wire,Proximity-sensing / Opposite Type Sensory Distance : 0-20m；Sending Light : Infrared Rays;Current : 300mA;Thread diameter: 12mm/0.47"

will these work as single unit and trigger if object is sensed by the beam?

Yes. It will send a signal every time the beam is broken thru a 3rd wire. You do have to have a counter or something attached to accept the signal

what is the switching speed of the npn receiver?

The actual switching time is about 2-3 microseconds on the one I've bought, but the minimum "break" time it responds to reliably seems to be at about 10 milliseconds with a 10K load resistor. you could probably increase the sensitivity with a larger load resistor but I haven't tried.

This product is not infrared!. it is red laser dot. do you have one that is really infrared (>800nm)?

I don't have one, sorry. Issue an open ended purchase order and I will develop one just for you. Thanks.

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Taiss /1 Pair Photoelectric Switches 0-20M Optical Reflection Beam Sensor Photoelectric Beam Sensor Npn In Photoelectric Sensor Switch 6-36V Lightning Beam Proximity Switch

Product ID: 555599385

📏0-20m sensing range

🔋6-36V DC wide voltage

🌧️IP66 weatherproof rating

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Description

🚀 Elevate your automation game with precision sensing that never quits!

EFFORTLESS INSTALLATION - Compact 12mm diameter and included mounting brackets make setup a breeze.
PLUG PLAY VERSATILITY - Wide 6-36V DC compatibility with NPN normally open output for seamless integration.
MULTI INDUSTRY POWERHOUSE - Perfect for gates, garage doors, industrial automation, and security systems—stay ahead of the curve.
BUILT TO BRAVE THE ELEMENTS - IP66-rated weatherproof design guarantees performance rain or shine, indoors or outdoors.
PRECISION SENSING AT DISTANCE - Reliable detection up to 20 meters ensures flawless automation and security.

The Taiss E3F-20DNL is a robust photoelectric beam sensor featuring a 0-20 meter infrared sensing range, IP66 weatherproof rating for reliable outdoor/indoor use, and a wide 6-36V DC power supply. Designed for security, industrial automation, and proximity detection, it offers easy installation with included mounting brackets and a compact form factor.

Specifications

ASIN	B07VPSSLBR
ASIN	B07VPSSLBR
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#85,227 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #192 in Motion Detectors
Customer Reviews	4.2 4.2 out of 5 stars (72)
Customer reviews	4.2 4.2 out of 5 stars (72)
Date First Available	5 August 2019
Date First Available	5 August 2019
Item Package Quantity	1
Item Weight	159 g
Item model number	E3F-20DNL
Item model number	E3F-20DNL
Manufacturer	Taiss
Manufacturer	Taiss
Package Dimensions	14.81 x 9.8 x 3.4 cm; 159 g
Package Dimensions	14.81 x 9.8 x 3.4 cm; 159 g
Part number	E3F-20DNL

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₩116642

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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