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

⚡5V low power operation

🎯<15° focused detection angle

📏3cm-450cm precise range

8712 Ft

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Description

📡 Elevate your projects with ultrasonic precision—don’t just measure, master your space!

ENERGY SMART DESIGN - Operates on a minimal 5V power supply with under 5mA current draw, perfect for sustainable builds.
COMPACT DURABLE BUILD - Sleek 45x20x15mm aluminum sensor modules protected by thermoplastic film for long-lasting reliability.
COMPLETE STEM STARTER PACK - Includes 5 sensors plus 20 Dupont cables and a premium package box—everything you need to innovate now.
PINPOINT ACCURACY AT SCALE - Measures distances from 3cm up to 4.5m with 3mm resolution for flawless project precision.
EFFORTLESS ARDUINO INTEGRATION - 100% compatible with Arduino boards, making your IoT and robotics projects plug-and-play ready.

The ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor Kit offers high-precision, non-contact distance measurement from 3cm to 450cm with 0.3cm resolution. Powered by a low 5V supply and featuring a focused detection angle under 15°, these compact aluminum sensors are fully compatible with Arduino platforms. Ideal for STEM education and IoT projects, the kit includes 5 sensors, 20 Dupont cables, and a protective package, empowering makers to build smart, energy-efficient, and reliable distance-sensing applications.

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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8712 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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