Do these things have to be plugged in?

I see from comments by others that I'm not the only one puzzled by your question. This device is a distance measuring sensor. As such, sensors need to be connected, or plugged into, other circuitry to make them work. In the case of the HC-SR04, it needs a signal, a pulse, from a circuit, Arduino microcontroller for example, to initial distance measurement and a circuit to receive the pulse signal from the HC-SR04 and do a time/distance calculation. Again an Arduino microcontoller. Is this all new to you? If so, there is a lot you will have to learn before you can use this device. There is plenty of help online however.

Can you keep them on 24/7 without running to reliability issues? Any thoughts?

No, this module has no waterproof and temperature compensation function, you need to look for the prefessional one if you want to use it on 24/7.

Will this work for a BeagleBone?

Can't say for sure, have only used these with Uno and Mega, work fine - note they have 4 pins (separate send/receive) as opposed to others with 3 pins (shared send/receive function). Great price - I've seen these sold for as much as $20 each.

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ELEGOO Ultrasonic Sensor

Product ID: 270871275

Details

Brand
ELEGOO
Item dimensions L x W x H
15 x 45 x 30
Item weight
0.02 Pounds
Material
Aluminum
Maximum supply voltage
5 Volts (DC)

⚡5V low power supply

🎯<15° precision angle

📏2cm-500cm range

Description

🚀 Elevate your robotics game with precision sensing that never sleeps!

COMPACT VERSATILE - Slim 15x45x30mm modules fit seamlessly into Arduino, MEGA2560, Nano, and robotics setups.
ENERGY SMART DESIGN - Operates efficiently on just 5V DC with under 2mA quiescent current—perfect for long projects.
PLUG PLAY MULTIPACK - Get 5 sensors plus a surprise gift—ideal for prototyping, scaling, or sharing with your maker squad.
RELIABLE ECHO DETECTION - 40kHz ultrasonic pulses ensure precise, real-time distance sensing for your next innovation.
PINPOINT DISTANCE ACCURACY - Measure objects from 2cm up to 5 meters with ultra-fine 0.3cm resolution.

The ELEGOO 5PCS HC-SR04 Ultrasonic Distance Sensor pack offers five compact, low-power modules capable of measuring distances from 2cm to 500cm with 0.3cm resolution. Designed for Arduino and compatible microcontrollers, these sensors use 40kHz ultrasonic pulses for accurate echo detection within a narrow 15° angle, making them ideal for robotics, electronics, and DIY projects.

Specifications

ASIN	B01COSN7O6
Best Sellers Rank	#129,464 in Computers ( See Top 100 in Computers ) #1,142 in Motherboards
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (619)
Global Trade Identification Number	00746591610333
Item Dimensions	15 x 45 x 30 millimeters
Item Weight	0.02 Pounds
Material Type	Aluminum
Maximum Supply Voltage	5 Volts (DC)
Measuring Range	2 - 500 cm
Model	EL-SM-001
Number of Items	5
Number of Packs	1
Output Type	digital
Part Number	EL-SM-001
Sensing Distance	500 Centimeters
UPC	719377200301 746591610333
Unit Count	5 Count

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