Compact 2piece set of active electromagnetic buzzers designed for security and surveillance use. Each unit is a 9 x 5.5 mm integrated horn and siren buzzer that operates at DC 3V, delivers approximately 85 dB output, and features a 2pole connection for straightforward installation. Key benefits Ready to use in lowvoltage systems: active design means no external driver is required; simply supply DC 3V and the unit produces sound. Clear audible alert: rated at about 85 dB for reliable attention in alarm and notification applications. Easy installation and replacement: twopole terminals make wiring fast and reduce installation errors. Small, lowprofile footprint: 9 x 5.5 mm size fits compact enclosures and spaceconstrained electronics. Pack of two for multiple points of installation or spare replacement. What it does and how it solves problems Provides an audible alarm source for security and surveillance systems where compact size and lowvoltage operation are important. Replaces larger or more complex modules with a single integrated buzzer that combines horn and siren tones, simplifying system design. Offers a costeffective way to add immediate audible alerts to control panels, sensors, or DIY projects without extra components. Key specifications Quantity: 2 pieces Size: 9 x 5.5 mm Operating voltage: DC 3V Sound level: approximately 85 dB Type: active electromagnetic buzzer Terminals: 2pole connection Compatibility and installation Suitable for use with 3V alarm panels, surveillance systems, access control units, sensor modules, and lowvoltage electronics. Compact size allows installation inside small housings, instrument panels, and custom enclosures. Twopole terminals allow quick wiring to power sources or driver boards. Typical applications Home or smallbusiness alarm systems: add compact audible alerts to sensors, door contacts, or alarm control units. CCTV and surveillance equipment: provide local audible warnings for motion detection or intrusion events. DIY electronics and security projects: integrate into custom alarm circuits, prototype boards, or teaching kits where space and lowvoltage operation matter. What to expect in use Reliable tone output at low supply voltage with minimal external components. Simple wiring and quick replacement when deploying multiple units across an installation. This product provides a practical, compact audible alert solution for security and surveillance setups and related lowvoltage electronic projects.