Where is the IR breakbeam tutorial ?

https://learn.adafruit.com/ir-breakbeam-sensors/overview

The holes under the emitter and receiver; are they screw holes for mounting? Or part of the system? Ie: can they be blocked without effecting the unit

Yes, they are for mounting and can be blocked without issue.

1 piece - does it mean that I need 2 items to implement a solution? The photos shows always 2 items. Or package includes sender and receiver as 1p.

Package Includes Send and Receive components as 1 piece.

Does the ir breakbeam detect transparent objects? if so, how well does it tell the difference between tranparent and opaque?

They are quite sensitive they will definitely detect opaque and probably transparent

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Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167]

Adafruit IR Break Beam Sensor - 3mm LEDs [ADA2167]

Product ID: 41086123

Details

Brand
Adafruit
Color
Black
Item Weight
0.01 Ounces
Maximum Range
25 Centimeters
Power Source
Corded

⚡Response <2ms

📏Range up to 10" (25cm)

🔋3.3-5.5V power input

€ 11.88

Duties & taxes included

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Description

🚀 Break the beam, not the flow—ultra-responsive IR motion sensing for pros.

HIGH CURRENT OUTPUT - Receiver sinks up to 100mA, ready to drive relays, LEDs, or other components directly.
DUAL VOLTAGE FLEXIBILITY - Operates seamlessly on 3.3V or 5V, optimizing power and range for your setup.
LIGHTNING FAST DETECTION - Experience motion sensing with <2ms response time—beat PIR sensors at their own game.
PRECISION CONTROLLED RANGE - Pinpoint motion within a 10-inch beam for targeted monitoring without false triggers.
COMPACT LIGHTWEIGHT DESIGN - Sleek 20x10x8mm sensor halves weighing just 3g each—perfect for discreet installations.

The Adafruit IR Break Beam Sensor (3mm LEDs) offers a rapid, precise motion detection solution with a sub-2ms response time and a 10-inch sensing range. Powered by 3.3 to 5.5 volts, it features an open collector transistor output capable of sinking 100mA, enabling direct control of relays or LEDs. Its compact size and lightweight design make it ideal for professional-grade security or automation projects requiring fast, reliable IR beam interruption detection.

Specifications

Asin	B01BU6YBWU
Battery Type	battery not included
Best Sellers Rank	#46,742 in Electronics (See Top 100 in Electronics) #190 in Motion Detectors (Electronics)
Brand	Adafruit
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (122) 4.5 out of 5 stars
Date First Available	February 16, 2016
Is Discontinued By Manufacturer	No
Item Model Number	2167
Item Weight	0.01 ounces
Manufacturer	Adafruit
Package Dimensions	2.91 x 2.4 x 0.39 inches
Power Source	Corded Electric

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