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In an emergency, the most important thing you have is time. The new SOS-IX siren-operated sensor allows emergency responders to pass through gates without delay. Forget punching codes, fiddling with keys, or ramming into the gate. This YELP siren opens gates within 2.8 seconds after it detects a siren.The SOS-IX is the newest SOS model available for purchase. Useful for residential, commercial, airport, government and military gates. SOS is compatible with all gate operators.What makes the new SOS-IX sensor better than older models: The enclosure features a hinged door that allows easy access to the control board. The unique mounting feet allow you to install this sensor quickly and easily. It is less expensive than its predecessors, giving everyone the chance to own this potentially life-saving piece of equipment.