When seconds matter,
Sentinel responds.

The market-leading, site-wide lockdown and invacuation system for schools, healthcare, and public venues. Designed for rapid, clear, and reliable emergency communication, Sentinel ensures full compliance with Martyn's Law, protecting your people the moment you need it most.

Speak to a Consultant Watch the 90-second explainer
<2s From press to alert
200+ Capacity threshold met
24/7 Always-on Hub
Sentinel lockdown alert system in a school corridor

Trusted By

UK education trusts Healthcare and NHS estates Local authority venues
Built in the United Kingdom ISO-aligned installation

Intelligent Automation. One-Touch Response.

When a trigger is activated, the Sentinel Hub acts as the command center for your entire site. It doesn't just sound an alarm; it streamlines your lockdown procedure - triggering voice announcements, sirens, strobes, door control, and automated alerts to your Alarm Receiving Centre.

By automating these vital actions, Sentinel eliminates the risk of human error in high-stress situations, ensuring your unique plan is executed flawlessly, in the right order, every time.

How a lockdown flows through sentinel
Wired call points
Trigger
Wireless Panic Button
Trigger
Sentinel App
Trigger
Sentinel Hub
Sentinel Hub
The Core
Voice Alerts
Response
Sirens & Strobes
Response
On Screen Alerts
Response
Get Alerts on Mobile
Response
Door Control
Response
Alarm Receiving Center
Response
Sentinel Hub
Sentinel Hub
The brain of the system. Every trigger feeds into the Hub, which instantly coordinates the entire response, voice, sirens, strobes, doors, screens and outside help, in the right order, every time.

Designed for the Procedures the SIA Expects

The Terrorism (Protection of Premises) Act 2025 Martyn's Law mandates robust public protection procedures for venues with a capacity of 200+. With education and healthcare sites named in Schedule 1, your facility must be prepared.

Sentinel doesn't replace your safety procedures; it makes them performable. With one press, your lockdown, invacuation, or evacuation plan executes instantly across your entire site.

Talk Us about your premises
Lockdown
Secure your site instantly, zone by zone.
Communication
Deliver clear, multilingual instructions to all staff and visitors simultaneously.
Invacuation
Rapidly guide people to internal, safe areas when exterior movement is a threat.
Evacuation
Trigger calm, directed exit routes through your existing PA & alarm.

See Sentinel in action

Watch how a single press travels through the Sentinel Hub to lock down an entire building, and stand it back down, in under two seconds.

Sentinel explainer video
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1:30

One press. Whole building response.

Staff can trigger Sentinel from anywhere, at a wall, in their pocket, or from their phone. Every method speaks to the same Sentinel Hub.

Method 1
Wired call point
Wired call points
Discreet, vandal-resistant wall units placed at strategic locations across every zone.
Method 2
Wireless panic button
Wireless Actication button
Personal activation devices for key staff and personnel.
Method 3
Sentinel mobile app
Sentinel mobile app
Authorised personnel can activate or stand down a lockdown securely from Apple or Android devices, anywhere on site.

Other systems make a noise. Sentinel runs a procedure.

While many market solutions are repurposed fire alarms or untested software, Sentinel is a dedicated, enterprise-grade system engineered exclusively for crisis management. Sentinel was built for this job, from the Hub up.

Works with the building you already have
Integrates seamlessly with your existing PA and access control systems. You get a modern lockdown solution without the cost of a "rip-and-replace" installation.
Rapid Activation
Sentinel eliminates the latency common in software-only solutions. Immediate, hardware-backed execution.
Calm, not chaotic
Don't rely on sirens that can trigger panic. Sentinel delivers consistent, clear verbal instructions, ensuring every occupant knows exactly how to react.
Zero-internet reliance
Unlike other systems, Sentinel functions fully without external connectivity, ensuring reliability even when the web goes down.
Built for the places that matter most

Who We Protect

Schools, colleges and universities
Schools, colleges & universities
Named in Schedule 1 of Martyn's Law. Sentinel scales from a primary classroom to a multi-building campus.
Hospitals and clinics
Hospitals & clinics
Designed for the unique demands of healthcare estates where calm, precise communication saves lives.
Local authority and publicly accessible buildings
Local authority & publicly accessible buildings
Town halls, leisure centres, libraries, museums, any publicly accessible premises that needs a credible lockdown procedure under Martyn's Law. Talk to us about scoping.

"We've drilled fire procedures for decades. Sentinel finally gave our staff something to drill for lockdown, and the confidence that the building would actually respond when they pressed it."

SM
Sarah Matthews
Estates Director, multi-academy trust

Let's lock down with confidence.

Book a no-obligation conversation with a Sentinel consultant. We'll walk your building, map the zones and design a system that fits your lockdown procedures.

Book a Demo Explore the system
20-minute online walkthrough
Site survey at your premises
Procedure-fit review with your safeguarding lead
Voice
Doors
All in one hub