{"product_id":"sfm-20b-active-piezo-buzzer-dc-3-24v-alarm-speaker-for-arduino","title":"SFM-20B Active Piezo Buzzer DC 3–24V Alarm Speaker for Arduino","description":"\u003ch2\u003eSFM-20B High-Decibel Active Piezo Buzzer – DC 3–24V Continuous Tone\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSFM-20B Active Piezoelectric Buzzer\u003c\/strong\u003e delivers a powerful, continuous-tone alarm signal across a wide 3–24V DC operating range. Whether you're building an Arduino alert system, a DIY security device, or any electronics project that needs a reliable audible indicator, this compact buzzer is ready to perform straight out of the box — no external oscillator required.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActive buzzer design\u003c\/strong\u003e – produces a continuous sound with a direct DC voltage; no additional signal generation needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide voltage range\u003c\/strong\u003e – operates on DC 3V to 24V, compatible with Arduino, Raspberry Pi, and most microcontroller projects\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiezoelectric technology\u003c\/strong\u003e – highly durable, low power consumption, and long operational life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh decibel output\u003c\/strong\u003e – loud, penetrating alarm tone ideal for alerts, notifications, and security applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel SFM-20B\u003c\/strong\u003e – compact form factor for easy PCB mounting or breadboard prototyping\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable in multipacks\u003c\/strong\u003e – choose from 1 to 10 pieces to suit your project needs or stock your workshop\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile use\u003c\/strong\u003e – suitable for alarms, timers, doorbells, electronic toys, and automation circuits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SFM-20B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Active Piezoelectric Buzzer \/ Speaker\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e DC 3V – 24V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSound Type:\u003c\/strong\u003e Continuous tone\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e Arduino, Raspberry Pi, general microcontroller boards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity Options:\u003c\/strong\u003e 1, 2, 3, 5, or 10 PCS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino and microcontroller alarm\/notification circuits\u003c\/li\u003e\n  \u003cli\u003eDIY home security and alert systems\u003c\/li\u003e\n  \u003cli\u003eElectronic timers and counters\u003c\/li\u003e\n  \u003cli\u003eRobotics projects requiring audible feedback\u003c\/li\u003e\n  \u003cli\u003eEducational electronics kits and prototyping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cp\u003eLooking for more tools and electronics accessories? Check out these popular picks from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0–10\/0–12\/0–25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between an active and passive piezo buzzer?\u003c\/h4\u003e\n\u003cp\u003eA: An \u003cstrong\u003eactive buzzer\u003c\/strong\u003e like the SFM-20B has a built-in oscillator circuit, so it produces sound when you simply apply DC voltage — no additional signal is needed from your microcontroller. A passive buzzer requires an external PWM signal to generate sound. This makes the SFM-20B much easier to use in Arduino and beginner electronics projects.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the SFM-20B compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The SFM-20B operates over a wide DC voltage range of 3V to 24V, making it fully compatible with Arduino (5V), Raspberry Pi (3.3V\/5V), ESP32, and virtually any other microcontroller or development board. Simply connect the positive lead to a digital output pin and the negative lead to ground.\u003c\/p\u003e\n\u003ch4\u003eQ: How loud is the SFM-20B buzzer?\u003c\/h4\u003e\n\u003cp\u003eA: The SFM-20B is rated as a high-decibel active buzzer, producing a clear and strong continuous tone well-suited for alarms, notifications, and audible indicators in both indoor and light outdoor environments. The actual volume will vary slightly depending on the supply voltage used.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I order multiple units at once?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This listing offers quantity options ranging from 1 to 10 pieces (1, 2, 3, 5, or 10 PCS), making it convenient to stock up for larger projects, classroom kits, or professional prototyping work.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between an active and passive piezo buzzer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An active buzzer like the SFM-20B has a built-in oscillator circuit, so it produces sound when you simply apply DC voltage — no additional signal is needed from your microcontroller. A passive buzzer requires an external PWM signal to generate sound. 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