{"product_id":"sfm-20b-active-piezo-buzzer-alarm-speaker-dc3-24v-arduino","title":"SFM-20B Active Piezo Buzzer Alarm Speaker DC 3–24V for Arduino","description":"\u003ch2\u003eSFM-20B Active Piezo Buzzer – High-Decibel Alarm Speaker for Arduino \u0026amp; Electronics Projects\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSFM-20B Active Piezoelectric Buzzer\u003c\/strong\u003e is a compact, high-decibel alarm speaker designed for makers, hobbyists, and engineers. With a wide operating voltage range of \u003cstrong\u003eDC 3V to 24V\u003c\/strong\u003e, it delivers a continuous, loud tone the moment power is applied — no additional signal generation required. Whether you're building security alarms, timer alerts, or interactive Arduino projects, this buzzer gets the job done reliably and efficiently.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SFM-20B Active Piezoelectric Buzzer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e DC 3V – 24V (wide compatibility)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Active buzzer — produces continuous sound without an external signal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Decibel Output:\u003c\/strong\u003e Loud, clear alarm tone ideal for alert and notification applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiezoelectric Design:\u003c\/strong\u003e Low power consumption and long operational lifespan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino Compatible:\u003c\/strong\u003e Plug-and-play integration with Arduino, Raspberry Pi, ESP32, and other microcontrollers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Quantity:\u003c\/strong\u003e Available in packs of 1 to 10 — stock up for multiple projects\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Easy to mount on breadboards or PCBs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat Is an Active Buzzer?\u003c\/h3\u003e\n\u003cp\u003eUnlike passive buzzers that require an external frequency signal, an \u003cstrong\u003eactive buzzer\u003c\/strong\u003e has a built-in oscillator circuit. Simply apply power within the rated voltage range and it emits a steady continuous tone instantly. This makes the SFM-20B perfect for beginners and rapid prototyping where simplicity is key.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; microcontroller alarm systems\u003c\/li\u003e\n  \u003cli\u003eSecurity and intrusion alert circuits\u003c\/li\u003e\n  \u003cli\u003eTimer and countdown notification devices\u003c\/li\u003e\n  \u003cli\u003eDIY electronics and maker projects\u003c\/li\u003e\n  \u003cli\u003eRobotics and automation feedback\u003c\/li\u003e\n  \u003cli\u003eEducational electronics kits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSFM-20B\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive Piezoelectric Buzzer\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 3V – 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSound Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eContinuous Tone\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eArduino, Raspberry Pi, ESP32, and more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\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 an internal oscillator, so it produces a continuous tone as soon as DC voltage is applied — no external frequency signal needed. A passive buzzer requires a PWM or square wave signal from a microcontroller to generate sound. The SFM-20B is ideal for simple, plug-and-play alarm applications.\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 from DC 3V to 24V, making it fully compatible with \u003cstrong\u003eArduino (5V)\u003c\/strong\u003e, Raspberry Pi (3.3V\/5V), ESP32, ESP8266, and virtually any other common microcontroller or development board. Simply connect the positive pin to your digital output pin (or direct power) and the negative pin to ground.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I buy multiple units in one order?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This listing offers packs ranging from \u003cstrong\u003e1 to 10 pieces\u003c\/strong\u003e, so you can order exactly the quantity you need for your project — whether it's a single prototype or a batch build.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the buzzer require any programming to work?\u003c\/h4\u003e\n\u003cp\u003eA: No programming is required for basic operation. Because it is an \u003cstrong\u003eactive buzzer\u003c\/strong\u003e, applying voltage within the 3–24V DC range is all it takes to start the continuous alarm tone. For on\/off control, you can simply use a digital output pin on your microcontroller.\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 an internal oscillator, so it produces a continuous tone as soon as DC voltage is applied — no external frequency signal needed. A passive buzzer requires a PWM or square wave signal from a microcontroller to generate sound. The SFM-20B is ideal for simple, plug-and-play alarm applications.\"}}, {\"@type\": \"Question\", \"name\": \"Is the SFM-20B compatible with Arduino and Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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