10PCS 42 Ohm TwoTerminal Passive 85dB Side Sound Electronic Buzzers for Security and Surveillance Product overview Pack of 10 passive electronic buzzers designed for clear audible alerts in security and surveillance installations. Each unit features a twoterminal connection, 42 ohm impedance, and side sound output rated at approximately 85 dB. These buzzers are suitable for use as horns and sirens when driven by an external signal source. Key benefits Reliable audible alerts: 85 dB sound output delivers a loud, noticeable tone for alarm and notification use. Easy installation: twoterminal design allows straightforward wiring to alarm panels, controllers, or driver circuits. Economical multipack: ten identical units simplify installation of multiple zones or replacement stocking. Flexible use: passive design accepts external drive signals so the same buzzer can produce different tones when needed. Main features and specifications Quantity: 10 pieces Type: Passive electronic buzzer Impedance: 42 ohm Terminals: Twoterminal connection Sound output: Side sound orientation, approximately 85 dB Function: Horn and siren style audible alert for security and surveillance systems Compatibility and application notes Passive units require an external oscillator or alarm driver. Confirm your controller can drive a 42 ohm load and supply an appropriate signal frequency. Side sound orientation concentrates output horizontally; consider mounting orientation for audibility. Practical use scenarios Alarm panels and security systems: Install multiple units across a site to provide consistent audible alerts for intrusions or system events. Access control and door entry: Add audible feedback at gates, doors, or turnstiles where a clear alarm tone is needed. Industrial or workshop alerts: Use as horns or sirens to signal machine status changes or to provide local warning tones when integrated with control systems. What makes these buzzers stand out Consistent specifications across a tenpiece pack for predictable performance during installation and maintenance. Simple twoterminal wiring and standard impedance for broad compatibility with common alarm drivers and controllers. Side sound design helps direct audio where it is needed most in enclosure or panel installations. Installation tips Verify the driving voltage and frequency recommended by your control system for tone and volume. Secure mounting and correct orientation improve audibility and reduce vibration noise. Test one unit before full deployment to confirm tone and volume meet site requirements.