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 for Arduino UNO MEGA2560 Nano Robot XBee ZigBee

ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor for Arduino UNO MEGA2560 Nano Robot XBee ZigBee

Product ID: 270871275

Details

Brand
ELEGOO
Item dimensions L x W x H
15 x 45 x 30
Item weight
0.02 Pounds
Maximum supply voltage
5 Volts (DC)
Measuring range
2 - 500 cm

⚡Power: 5V DC

📏Distance: 2cm-500cm

🔊40KHz ultrasonic pulses

Description

🚀 Elevate Your Projects with Precision!

BONUS GIFT INCLUDED - Receive a little surprise with your purchase!
WIDE DETECTION RANGE - Measure distances from as close as 2 cm to as far as 500 cm.
LOW POWER CONSUMPTION - Operate efficiently with a quiescent current of less than 2mA.
PRECISION MEASUREMENT - Achieve accurate distance readings with a resolution of 0.3 cm.
VERSATILE COMPATIBILITY - Perfectly compatible with Arduino UNO, MEGA2560, Nano, and more.

The ELEGOO 5PCS HC-SR04 Ultrasonic Module Distance Sensor is a high-performance distance measuring transducer designed for various applications, including robotics and automation. With a detection range of 2cm to 500cm and a resolution of 0.3 cm, this sensor is perfect for hobbyists and professionals alike. Each package includes five sensors, ensuring you have enough for multiple projects, along with a special gift to enhance your experience.

Specifications

ASIN	B01COSN7O6
Brand Name	ELEGOO
Customer Reviews	4.6 4.6 out of 5 stars (592)
Global Trade Identification Number	00746591610333
Item Dimensions	15 x 45 x 30 millimeters
Item Weight	0.02 Pounds
Maximum Supply Voltage	5 Volts (DC)
Measuring Range	2 - 500 cm
Model	EL-SM-001
Output Type	digital
Part Number	EL-SM-001
Sensing Distance	500 Centimeters
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	electronics, robotics, distance measurement
UPC	719377200301 746591610333
Unit Count	5 Count

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