Extend building gunshot detection capabilities outside with the Shooter Detection Systems Perimeter Outdoor Gunshot Detection Sensor. Using the same dual-factor acoustic and infrared technologies found in the SDS Indoor Gunshot Detection System, it offers a 99.9% detection accuracy rate. Alerts occur in less than 3 seconds and can distinguish between a handgun vs long gun. Unlike other outdoor systems, SDS Perimeter is not a listening device—no audio leaves the sensor, and the microphones are tuned for high-decibel impulsive sounds. It can operate as a standalone, single, or multiple outdoor sensor system and works seamlessly with SDS Indoor, giving organizations complete situational awareness during a gun violence event.