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Stemedu 5PCS SFM-27 DC 3-24V Alarm Siren Electronic Piezo Active Buzzer, 95dB High Decibel Continuous Beep Speaker for Arduino

4.4 out of 5 stars 80 ratings
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Purchase options and add-ons

Colour Black
Brand Stemedu
Power source Corded Electric
Compatible devices Electronic Security Systems
Product Dimensions 29L x 29W x 15H millimeters

About this item

  • Voltage range: Operating voltage 3-24V, rated voltage 12V
  • Size: Alarm diameter 29mm/ 1.14", height 15mm/ 0.59"
  • Sound level: Produces continuous high-decibel alarm sound up to 95dB
  • Applications: Suitable for car modification, DIY electronics projects, and other sound alarm needs
  • Package contents: Includes 5pcs 95DB black active buzzers

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Product Description

SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder

  • Color: Black
  • Acoustic piezoelectric frequency: 100dB at 12VDC/30cm
  • Resonant frequency: 2.5±0.5KHZ
  • Working temperature: -20~45 degree
  • Storage temperature: -20~60 degree

SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder

  • Rated Voltage: 12V
  • Operating Voltage: 3-24V
  • Rated current: 15MA at 12VDC
  • Rated Current(MAX): 20mA
  • Min Sound Output at 10 cm: 95 DB
  • Resonant Frequency: 31001500

SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder

  • Double ears design, easy to fix
  • Smooth surface
  • It is an active buzzer, usually used in car / safe box anti-theft burglar alarm.

SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder

Dimension

  • Alarm Diameter: 29mm/ 1.14"
  • Alarm Height: 15mm/ 0.59" 2
  • Mounting Holes distance: 40mm/ 1.57"
  • 2 Wires length: 105mm 14.13"

SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder

SFM-27 Electronic Buzzer Beep Continuous Beep for Arduino

This buzzer is a kind of electronic buzzer with integrated structure. It uses DC voltage to supply power.

It is widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products as sound devices.

Classification of buzzers Buzzers are mainly divided into two types: piezoelectric buzzer and electromagnetic buzzer.

Package included:

  • 5 X SFM-27 Piezoelectric buzzer active alarm sounder

The structure principle of the buzzer

  • 1. Piezoelectric buzzer

The piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonance box, and a shell. Some piezoelectric buzzers are also equipped with light-emitting diodes.

The multivibrator is composed of transistors or integrated circuits. When the power is turned on (1.5~15V DC working voltage), the multivibrator starts to vibrate and outputs 1.5~2.5kHZ audio signals, and the impedance matcher drives the piezoelectric buzzer to sound.

The piezoelectric buzzer is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic sheet, and after polarization and aging treatment, they are then glued together with the brass sheet or the stainless steel sheet.

  • 2. Electromagnetic buzzer

The electromagnetic buzzer is composed of oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm periodically vibrates and produces sound under the interaction of the electromagnetic coil and the magnet.

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Customer Reviews
4.2 out of 5 stars 33
3.8 out of 5 stars 36
4.4 out of 5 stars 322
4.3 out of 5 stars 27
4.9 out of 5 stars 16
3.9 out of 5 stars 171
Name 5PCS Alarm Siren Module DC 12V, Black Electronic Piezo Buzzers, 110dB High-Decibel Sounder for Security System 5PCS MAX7219 8-Digital 7-Segment Display Module LED Display Tube for MCU/51/AVR/STM32 Raspberry Pi ESP8266 Node-mcu HC-SR501 PIR Motion Sensor Infrared IR Body Motion Detectors Module for Arduino Raspberry Pi(Pack of 5pcs) 240pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Wires Ribbon Cables Kit for arduino 4PCS LXW5-11N1 Microswitch SPDT 1NO 1NC Micro Limit Switch Hinge Lever Momentary Push Button Switches 3A AC380V DC220V (Pack of 4) 5PCS RCWL-0516 Motion Detection Sensor Microwave Radar Sensor Switch Module for Arduino for Human, Rat, Cat Detector Detection Distance 5-7m Better Than HC-SR501
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Customer Reviews
4.5 out of 5 stars 56
4.7 out of 5 stars 24
4.0 out of 5 stars 55
4.1 out of 5 stars 58
4.6 out of 5 stars 7
4.4 out of 5 stars 39
Product Name Stemedu 1460 PCS Resistors Assortment Kit, 1/4W 1% Metal Film Resistor Pack, 1 ohm - 1M ohm Assorted Resistance Set, 73 Values, 20 pcs per Value, Individual Bags with Tags for DIY Electronic Projects 600 Pcs Resistor Assortment Kit, 0.25 Watt 10 Ohm-1M Ohm 30 Values 1% 1/4W Metal Film Assorted Resistors Pack 3PCS LM2596 DC to DC Buck Converter 4-40V to 1.25-37V Adjustable Voltage Regulator Step-Down Module with LED Voltmeter Display 3A 2PCS Micro SD Card Module TF Card Memory Storage Adapter Reader Board SPI Interface with Integrated Circuit Breakout 10PCS 5V 1A Micro USB 18650 Lithium Battery Charging Board TP4056 Charger Module with Protection Stemedu 5pcs Single 18650 Battery Storage Case 1 Slot 3.7V Black Plastic Battery Container for 18650 Battery Holder Box with Connect Leads

Product information

Technical Details

Voltage ‎24 Volts
Control method ‎Touch
Noise level ‎95 dB
Mounting type ‎Wall Mount
Manufacturer ‎Stemedu
Part Number ‎ST3486X5
Product Dimensions ‎2.9 x 2.9 x 1.5 cm; 32 g
Item model number ‎ST3486X5
Item Package Quantity ‎1
Included Components ‎DC 3-24V Electronic Buzzer Alarm Sounder Continuous Beep 5PCS
Batteries Included? ‎No
Batteries Required? ‎No
Item Weight ‎32 g

Additional Information

ASIN B096P5K9W1
Customer Reviews
4.4 out of 5 stars 80 ratings

4.4 out of 5 stars
鶹 Rank
Date First Available June 22 2021

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Stemedu 5PCS SFM-27 DC 3-24V Alarm Siren Electronic Piezo Active Buzzer, 95dB High Decibel Continuous Beep Speaker for Arduino

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Price$14.92$21.98$8.20$17.39$20.99
Delivery
Get it by Sunday, Jun 29
Get it by Sunday, Jun 29
Get it by Monday, Jun 30
Get it by Sunday, Jun 29
Get it by Sunday, Jun 29
Customer ratings
4.44.4 out of 5 stars80
4.24.2 out of 5 stars33
4.24.2 out of 5 stars38
5.05.0 out of 5 stars4
5.05.0 out of 5 stars4
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4.4 out of 5 stars
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Top reviews from Canada

  • Monty Greig
    5.0 out of 5 stars 24V buzzers
    Reviewed in Canada on April 17, 2024
    Verified Purchase
    i use these as alert buttons for my custom products. High quality alarm would definitely recommend them.
    Helpful
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  • Sukhninder Singh Dhillon
    5.0 out of 5 stars Good product
    Reviewed in Canada on April 16, 2024
    Verified Purchase
    Great product in good price no issue
    Helpful
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  • Ryan
    4.0 out of 5 stars They work well
    Reviewed in Canada on June 30, 2024
    Verified Purchase
    Loud
    Helpful
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  • The Tech Guy
    5.0 out of 5 stars Typical 12V Piezo Siren
    Reviewed in Canada on July 13, 2023
    鶹 Vine Customer Review of Free Product( What's this? )
    This is your typical 12V Piezo Buzzer/Siren good for alarm panels, doorbells or other audio notification applications. They work with voltage from 3V-24V and are loud. You get 5 sirens in the package for $12 so $2.40 each which is a good deal. I would order these again
    Helpful
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  • Shopbot
    4.0 out of 5 stars these are loud but may not be as loud as claimed
    Reviewed in Canada on July 12, 2023
    鶹 Vine Customer Review of Free Product( What's this? )
    This 5 pack of piezo buzzers from Stemedu are designed for Arduino projects. Stemedu claims a 95db output but did not provide any additional information. To my ears, they do sound fairly loud but definitely not as loud as the smoke detector in my house. The voltage range is DC 3 to 24 V so perhaps it will sound louder if I had used a higher voltage. The current price of $12 CAD for 5 means each are about $2.40.
    One person found this helpful
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  • Shawn C.
    2.0 out of 5 stars Not fit for use on fpv drones
    Reviewed in Canada on February 3, 2025
    Verified Purchase
    Too big for a drone, and not loud enough at 5V to be heard from 25 feet.
    I returned the item, and will look for a smaller buzzer.
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Top reviews from other countries

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  • Michael C.
    5.0 out of 5 stars Great buy
    Reviewed in the United Kingdom on October 28, 2023
    鶹 Vine Customer Review of Free Product( What's this? )
    These are decent low voltage buzzer, I use it at 12V.

    I bought another type of low voltage DC buzzers from 鶹 that I use for alarm notification when certain temperature is reached. but wanted a different sound for different temperature.

    Would recommend this
    Report
  • John Englund
    5.0 out of 5 stars High quality alarms
    Reviewed in the United States on February 5, 2025
    Verified Purchase
    I got these alarms for a project at work. The alarms function every time I needed them too. It was for a lockout tag out project.
    Report
  • lilith
    3.0 out of 5 stars Non è una sirena, il suono è continuo
    Reviewed in Italy on October 30, 2022
    Verified Purchase
    Sarebbe da 5 stelle se la descrizione fosse coerente con il prodotto: ottimo cicalino continuo, MA NON È UNA SIRENA.
    Report
  • Fabian S
    5.0 out of 5 stars Super
    Reviewed in Germany on January 20, 2025
    Verified Purchase
    Sind laut, Verarbeitung gut
    Report
  • Paul R
    4.0 out of 5 stars Not bad, but falls slightly short of specs.
    Reviewed in the United Kingdom on October 23, 2023
    鶹 Vine Customer Review of Free Product( What's this? )
    I've used piezo crystal buzzers before on simple projects, and at low voltages they tend to be very quiet. I thought I'd give these a try to see how loud they are at lower voltages.

    This buzzer just needs a voltage, no control is required. This means it's simple to use, but only outputs a single tone.

    Firstly, at 12v, this is pretty loud. Not sure if it's 95db, but it's uncomfortable. It also does operate at 3v but noticeably quieter, yet still louder than other piezo buzzers. There is a caveat to this however. The buzzer doesn't start to operate until about 4.8v is applied (according to my benchtop power supply). Once sounding you can drop the voltage to 3v with no problems and it keeps going.

    As for power consumption, it's around 4ma per 3v. So ~4mah @ 3v, ~8mah @ 6v, ~17mah @ 12v (again according to my benchtop power supply).

    If it operated properly at 3v this would be 5*, but I have to drop a star because it won't start buzzing @ 3v.
    Report