SOS 12 Siren-Operated Emergency Access Sensor

ergency. Currently used throughout the Americas and Europe and mandated in many communities

Siren Activated Emergency Gate Access Sensor for First Responders

The SOS 12 Siren-Operated Sensor is a trusted emergency access solution that opens gates automatically in response to a first responder’s siren. Widely used and often mandated nationwide, this fail-safe sensor listens for the “YELP” siren tone and triggers gate access within seconds - without requiring any radio signals, remotes, or prior programming. With adjustable sensitivity, programmable latch times, and dual reset buttons, the SOS 12 delivers reliable and code-compliant access control for gated communities, commercial properties, fire departments, airports, and industrial facilities.

Key Features

• Siren-activated gate access triggered by standard emergency “YELP” siren within 3 seconds
• Adjustable sensitivity range: 80 to 125 dB via onboard potentiometer
• Programmable latch times: 5 minutes, 15 minutes, 1 hour, or latched until reset
• Dual reset buttons: External and internal for convenient reactivation
• Power-efficient design: 0.1 mA standby, 25 mA active
• Wide operating range: -30°F to 120°F (-34°C to 49°C)
• All-weather enclosure: Compact, weather-resistant housing for outdoor installations
• Includes MP3 test tone for accurate setup using siren simulation
• Compatible with virtually all gate operators via dry contact output

Technical Specifications

• Model: SOS 12
• Power Supply: 9–30VDC or 9–16VAC
• Current Draw: 0.1 mA standby / 25 mA triggered
• Sensitivity Adjustment: 80–125 dB
• Output Type: Dry contact (Normally Open)
• Reset Buttons: 2 (internal and external)
• Latch Time Settings: Normal cycle, 5 min, 15 min, 1 hr, or latch open
• Temperature Range: -30°F to 120°F (-34°C to 49°C)
• Wire Gauge: 18–22 AWG (not included)
• Enclosure Dimensions: 6.79” H × 4.72” W × 2.02” D
• Reflective Sign: included

Conclusion

The SOS 12 is the industry’s leading siren-operated sensor, trusted by emergency services nationwide for fast, reliable gate access. Its proven performance, low power consumption, and broad compatibility make it the gold standard for first responder gate entry solutions. Designed for critical infrastructure and perimeter security, it ensures gates open exactly when lives depend on it.

 • Sensitivity set at 9: The unit will trigger at 80 decibels