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

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

Product ID: 49282932

Details

Brand
Cylewet
Color
Black
Control Method
Touch
Power Source
Corded
Voltage
24 volts

⚡3-24V wide voltage range

📏Compact 3cm diameter

🔊100dB piercing sound

€ 14.67

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Description

🔔 Stay ahead with the buzzer that never quits!

RELIABLE DURABILITY - Operates smoothly from -20°C to 45°C, built to last
PIERCING 100 D B ALERT - Cut through noise with crystal-clear alarms
COMPACT LIGHTWEIGHT - Sleek 3cm diameter with just 20g weight for easy installation
PLUG PLAY CONVENIENCE - 11cm wire length for quick, hassle-free mounting
VERSATILE 3 24 V OPERATION - Fits any setup from low to high voltage effortlessly

This 5-pack of SFM-27 electronic buzzer alarms delivers a powerful 100dB sound at 12V, operating efficiently across a broad 3-24V range. Compact and lightweight with a 3cm diameter and 11cm wire, these buzzers are designed for easy wall mounting and reliable performance in temperatures from -20°C to 45°C. Ideal for security and alert systems, they combine versatility and durability in one sleek package.

Specifications

ASIN	B075PT19J2
Audible Noise	100 db
Best Sellers Rank	#112 in Security Horns & Sirens
Brand	Cylewet
Color	Black
Control Method	Touch
Customer Reviews	4.5 4.5 out of 5 stars (724)
Item Weight	0.02 kg
Manufacturer	Qianxin
Mfr Part Number	CYT1083
Model Number	3216550315
Mounting Type	Wall Mount
Number of Items	5
Power Source	Corded Electric
Size	3cm /1.2in
UPC	743447407529
Unit Count	5 Count
Voltage	24 volts

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

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€ 14.67

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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