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

⚡Ultra-fast <2ms response

📏Precise 10" (25cm) detection range

🔋Dual voltage 3.3-5.5V power

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Description

🚀 Detect motion before it even happens — precision IR sensing for the savvy pro.

FLEXIBLE POWER OPTIONS - Runs seamlessly on 3.3V or 5V, optimizing range and efficiency for your setup.
PINPOINT SENSING CONTROL - Target exact zones with a focused 10° IR beam and 10-inch range for smarter security.
COMPACT LIGHTWEIGHT DESIGN - At just 20x10x8mm and 3g, it fits discreetly anywhere you need instant motion alerts.
LIGHTNING FAST MOTION DETECTION - Break beams react in under 2 milliseconds, leaving PIR sensors in the dust.
PLUG AND PLAY MICROCONTROLLER COMPATIBILITY - Open collector output with built-in pull-up resistor support for effortless integration.

The Adafruit IR Break Beam Sensor (3mm LEDs) offers ultra-fast, precise motion detection with a 10-inch range and sub-2ms response time. Powered by 3.3-5.5V, it features an open collector transistor output for easy microcontroller integration. Compact and lightweight, it’s ideal for smart home security, lighting control, and any project demanding reliable, targeted motion sensing.

Specifications

ASIN	B01BU6YBWU
Battery Type	battery not included
Best Sellers Rank	#160,007 in Electronics ( See Top 100 in Electronics ) #561 in Motion Detectors (Electronics)
Brand	Adafruit
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (121)
Date First Available	February 16, 2016
Is Discontinued By Manufacturer	No
Item Weight	0.01 ounces
Item model number	2167
Manufacturer	Adafruit
Package Dimensions	2.91 x 2.4 x 0.39 inches
Power Source	Corded Electric

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