Will this work in a school experiment with a D battery as the power source to make the buzzer go off when the circuit is complete?

I didn't have a D battery handy, but, It did work on a AA 1.5v battery. So, I would think it would work fine on your D battery. I use these as a circuit tester, for when I cant see my test light or meter on 12 volt systems.

The description somewhat confusing; Is tone one long beep....... or is it beep, beep, beep, etc?

It's a continuous high pitched "beep" noise as long as voltage is applied. Very similar tone to the backup beepers in vehicles. It does not pulse on and off unless you control the voltage on and off.

appropriate for a classroom lab?

Should work very well in teaching situation

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🔔 Never miss a beat with the buzzer that commands attention!

POWERFUL 100 D B ALERT - Cut through noise with crystal-clear, attention-grabbing sound.
PLUG PLAY CONVENIENCE - Includes built-in batteries—no extra power source needed.
COMPACT LIGHTWEIGHT DESIGN - Small 3cm diameter and just 0.7oz for easy wall mounting anywhere.
PACK OF 5 FOR MAXIMUM COVERAGE - Equip multiple zones or projects without running out.
VERSATILE VOLTAGE COMPATIBILITY - Operates seamlessly from 3V up to 24V for flexible integration.

The 5Pcs SFM-27 Electronic Buzzer Alarm Sounder delivers a piercing 100dB beep at 12V, operating efficiently across a broad 3-24V range. Compact and lightweight with a 3cm diameter, it’s designed for easy wall mounting and comes in a convenient 5-pack with built-in batteries, making it ideal for professional and DIY alert systems.

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Noise Level	100 dB
Mounting Type	Wall Mount
UPC	743447407529
Manufacturer	Qianxin
Part Number	CYT1083
Item Weight	0.704 ounces
Package Dimensions	4.8 x 4.29 x 0.87 inches
Item model number	3216550315
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	Yes
Batteries Required?	No

5Pcs SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder Continuous Sound Beep (Pack of 5) CYT1083

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