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 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit

ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit

Product ID: 25292147

Details

Brand
ELEGOO
Item Weight
9.07 g
Item dimensions L x W x H
0.59 x 1.77 x
Material
Aluminum
Maximum Supply Voltage
5 volts

⚡Low power <2mA standby

🎯15° focused detection angle

📏Accurate 3-450 cm range

€ 16.56

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Measure smarter, build faster, stay ahead.

MULTIPACK VALUE - Get 5 sensors in one kit—ideal for prototyping, STEM projects, and scaling your innovations.
COMPACT LIGHTWEIGHT - Sleek 0.59x1.77x1.18 inch sensor weighing just 9g fits seamlessly into any setup.
ENERGY EFFICIENT DESIGN - Consumes less than 2mA in standby, perfect for long-term, low-power applications.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino UNO, MEGA, Nano, and popular robotics platforms.
PRECISION DISTANCE SENSING - Pinpoint measurements from 3cm up to 4.5m for flawless project accuracy.

The ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit delivers precise distance measurements from 3cm to 450cm with a focused 15° detection angle. Operating at 5V DC with ultra-low standby current under 2mA, this compact and lightweight sensor is perfect for Arduino and robotics projects. The 5-pack kit offers excellent value for prototyping and STEM applications, backed by a trusted brand with high customer ratings.

Specifications

ASIN	B01COSN7O6
Best Sellers Rank	#26,729 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Ultrasonic Proximity Sensors
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (617)
Global Trade Identification Number	00746591610333
Included Components	Ultrasonic Sensor
Item Dimensions	0.59 x 1.77 x 1.18 inches
Item Weight	9.07 g
Manufacturer	ELEGOO
Material Type	Aluminum
Maximum Supply Voltage	5 volts
Measuring Range	2 centimeters to 500 centimeters
Model	EL-SM-001
Number of Items	1
Output Type	TTL
Part Number	EL-SM-001
Sensing Distance	2
Specific Uses For Product	Personal
UPC	719377200301 746591610333
Unit Count	1 Count
Warranty Description	6 MONTHS

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