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 Switch 0-20M Through-Beam Reflection Optical Photoelectric Beam Sensor NPN NO photoelectric Sensor Switch 6-36V Proximity Switch with Infrared Ray Beam E3F-20DNL-Z-12MM

Taiss/1 Pair photoelectric Switch 0-20M Through-Beam Reflection Optical Photoelectric Beam Sensor NPN NO photoelectric Sensor Switch 6-36V Proximity Switch with Infrared Ray Beam E3F-20DNL-Z-12MM

Product ID: 162777862

📏0-20m sensing range

🔴Infrared laser beam

🌧️IP66 weatherproof rating

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Description

🔴 See the unseen: Next-level precision sensing for your smart space

COMPACT DURABLE - Slim 12mm diameter sensor body fits tight spaces without compromise
BUILT FOR ALL WEATHER - IP66-rated rugged design ensures reliable outdoor and indoor use
PLUG PLAY INTEGRATION - Wide 6-36V DC compatibility with NPN normally open output for seamless setup
VERSATILE APPLICATION READY - Ideal for garage doors, security gates, industrial automation, and more
PRECISION SENSING AT DISTANCE - Detect objects up to 20 meters with pinpoint accuracy

The Taiss Photoelectric Switch is a high-performance infrared beam sensor with a 0-20 meter detection range, designed for both indoor and outdoor environments thanks to its IP66 weatherproof rating. Operating on 6-36V DC with an NPN normally open output, it offers easy integration into security systems, industrial automation, and access control setups. Its compact 12mm diameter and included mounting brackets make installation straightforward, while the infrared laser beam ensures precise and reliable object detection.

Specifications

ASIN	B07VPSSLBR
Best Sellers Rank	#68,789 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Photoelectric Sensors
Date First Available	July 25, 2019
Item Weight	5.6 ounces
Item model number	E3F-20DNL
Manufacturer	Taiss
Package Dimensions	5.83 x 3.86 x 1.34 inches

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