Audio surveillance has evolved to play a major role in security by detecting and analyzing sounds that represent potential threats or events.
Security surveillance in the past has often been associated with images or videos. However, audio surveillance has evolved to play a major role in security by detecting and analyzing sounds that represent potential threats or events. The advancement of technology allows for features such as pinpoint the location of the gunshot, recognize the aggression of voices, and detect sound of possible break-in.
Louroe Electronics Intelligent Audio Analytics System LE-802 
The LE-802 offers a robust, easy-to-use and easy-to-install system for unattended audio monitoring of specific events such as gunshots, aggressive speech, glass breaking and car alarms. The system is a complete hardware and software solution that is housed in a weather and vandal resistant enclosure for outdoor applications. It provides for constant 360° audio monitoring over large areas and is designed for easy installation on most city utility poles or walls.
KEY FEATURES:
- PoE-powered
- Weather and vandal resistant enclosure
- Constant 360° audio monitoring over large areas
- Easy installation on most city utility poles or walls
- Sends notifications to network or connected devices
Guardian Indoor Active Shooter Detection
The Guardian Indoor Active Shooter Detection System incorporates acoustic gunshot identification software and combines it with infrared camera gunfire flash detection to produce one of the most capable indoor gunshot detection system available today. The system's dual modality provides the highest rate of detection while bringing the number of potential false alerts to zero.
KEY FEATURES:
- Once a weapon is fired, two key events instantly occur: an infrared flash and an acoustic bang
- The sensors both “see” and “hear” events, process the information and declare a shot alert with certainty to the user
- The customizable software embedded in the Guardian solution monitors the sensors and provides audio and visually relevant alerts
- SMS and email notifications for shot alerts and system maintenance warnings to building occupants, emergency personnel and/or local law enforcement
- Designed to connect to existing client security panel via relay output interface
Shotspotter Flex 
ShotSpotter Flex helps law enforcement agencies by directing the police to the precise location of illegal gunfire incidents. ShotSpotter instantly notifies officers of shootings in progress with real-time data delivered to dispatch centers, patrol cars and even smart phones. Instant alerts enable first responders to aid victims, collect evidence and quickly apprehend armed, dangerous offenders.
KEY FEATURES:
- Constant, 360-degree wide-area acoustic surveillance throughout large coverage areas
- Provides precise location including latitude/longitude, street address
- Number and exact time of rounds fired
- Identification of fully-automatic or high-capacity weapons
- Identification of multiple shooters
- Detailed forensic data for investigation, prosecution and analysis
NLSS Gateway
NLSS Gateway is a unified solution that combines multiple systems including video management, access control, analytics, audio and intrusion into a single, easy-to-use networked platform. Built-in audio analytics provides a tool for immediate identification of threats or potential threats identified through audio monitoring. The NLSS Gateway has the ability to listen for certain sounds through microphone inputs on certain IP cameras. This type of monitoring can provide visibility to events that would not be detected with a video-only system.
KEY FEATURES:
- Detects crimes and events by analyzing audio Aggression/scream detection - recognizes aggressive speech and shouting from speakers
- Gunshot detection - enables immediate action whenever a gunshot is fired; initiates facility lockdowns
- Glass breakage detection - detects sounds of attempted break-ins
- Car alarm detection - provides alert of the potential for an attempted car theft or break-in