4 Pack DC 5V Active Magnetic Buzzer Continuous Beep Tone Alarm Compact 12 mm x 6.5 mm active buzzers for clear, continuous alert tones. Each unit is a magnetic type active buzzer that produces a steady beep when supplied with DC 5V. Ideal for electronics projects, alarm circuits, and status indicators. Key benefits Easy to use: Active buzzer requires only a DC 5V supply to sound. No external oscillator or driver circuitry is needed. Compact and spacesaving: Small footprint (12 mm diameter x 6.5 mm height) fits tight enclosures and PCB mounting. Reliable audible alert: Magnetic construction produces a consistent continuous tone for alarms and notifications. Ready for multiuse: Pack of 4 units provides spares or allows multiple alarm points without ordering extra components. Main features and specifications Type: Active magnetic buzzer, continuous beep tone Supply voltage: DC 5V Quantity: 4 pieces per set Size: 12 mm diameter x 6.5 mm height Connection: Twopin power connection (positive and ground) Housing: Compact sealed housing suitable for electronic assemblies Why you need this product Simplifies alarm and notification circuits by eliminating the need for external tone generation. Saves space in compact devices with a small, lowprofile form factor. Provides a dependable audible signal for a wide range of projects and equipment. Compatibility and use Compatible with 5V control and power systems used in microcontroller projects and electronic control circuits. Can be driven directly from a 5V supply or switched via a transistor or driver stage where required. Practical applications DIY electronics and prototyping: Add audible alerts to breadboard projects, development boards, and educational kits. Alarm and security systems: Use as a local audible indicator for door sensors, motion detectors, or tamper alerts. Appliances and equipment: Integrate into timers, controllers, and consumer devices as a simple status or fault indicator. What is included Four active magnetic buzzers, each rated for DC 5V and sized 12 mm x 6.5 mm. Simple installation tips Observe polarity when wiring: connect the positive supply to the buzzer positive pin and ground to the negative pin. If controlling from a microcontroller pin, use a transistor or driver and appropriate currentlimiting or protection as required by your circuit design. This 4piece set provides compact, easytoinstall continuoustone buzzers suitable for a wide variety of electronic and alarm applications.