Sentinel™, the ONLY Plug & Play Gunshot Detection Emerging Technology Solution in the Market Today! Or as we like to say… Plug & Protect! Gunshot Detection Device: Discharged weapons are detected within milliseconds by Sentinel™, allowing critical information to be sent to first responders within seconds. Sentinel is designed to prevent false positives. Integration: Sentinel™ is easily installed inexpensively into new or existing security systems.