Buy External Slave Sounder – Wireless Outdoor Lockdown Alarm Unit

The External Slave Sounder extends your lockdown coverage outdoors, providing a loud siren and bright beacon in
playgrounds, yards, car parks and external entrances so people outside the building receive the same clear lockdown
alert as those indoors.

Lockdown Alarm Sounds

If you would like to hear typical tones and alerts used with this system, you can listen here:

Listen to Lockdown Alarm Sounds & Alerts

Overview

The External Slave Sounder is a weather-resistant wireless unit designed to take your lockdown alarm outdoors.
It receives the same wireless signal as your internal devices and delivers a clear audible and visual alert to
people in playgrounds, outdoor walkways, car parks and external waiting areas.

It is ideal for schools, academies, nurseries, public venues and workplaces that want outdoor lockdown coverage
without running new cabling or relying on Wi-Fi or network infrastructure.

Key Features of the External Slave Sounder

Weatherproof external lockdown sounder and beacon.
Receives wireless activation from your Master Call Point and remote keyfob.
Provides loud, clear audio and bright visual alert outdoors.
Fully wireless operation – no reliance on Wi-Fi, data or cabled networks.
Battery powered so it continues working during mains power failures.
Synchronised with internal sounders for whole-site lockdown coverage.
Designed for UK schools, MAT sites, public venues and workplaces preparing for Martyn’s Law.

How the External Slave Sounder Works

The External Slave Sounder does not trigger lockdown on its own – it responds when the system is activated.
Once a lockdown is started, it ensures outdoor areas receive the same alert as internal spaces.

A member of staff activates lockdown using the Master Call Point or a remote keyfob.
The secure RF system sends a signal to all linked internal and external units.
The External Slave Sounder (and other sounders) switch on together.
People outdoors hear the lockdown alarm and see the beacon, prompting them to follow your procedures.
The system is reset via the Master Call Point once the incident or drill is complete.

Because communication is wireless, there is no need to dig trenches or run new power/data cabling to external walls,
making this a practical option for existing buildings and busy school sites.

Where This External Slave Sounder Is Typically Used

This external unit is used wherever you need lockdown alerts to reach people outside the main buildings:

School playgrounds and external teaching areas.
Sports courts and MUGA pitches adjacent to school buildings.
External walkways, entrances and drop-off zones.
Car parks, staff parking and visitor parking areas.
Outdoor assembly points and waiting zones.
Loading bays and warehouse yard areas.

Many of these sites are now reviewing emergency communications in line with current guidance for venues hosting
200+ members of the public. While not every site requires a full system overhaul, a reliable,
wireless outdoor lockdown sounder is increasingly seen as part of sensible Protect Duty planning.

Technical Summary

Product type: Wireless external lockdown sounder & beacon (Slave Sounder)
Function: Audible and visual alert unit – no local trigger button
Wireless type: Secure RF mesh network (each unit can act as a repeater)
Frequency: 434.525 MHz
Transmission power: 10 mW
Wireless range: Up to approx. 1 km line of sight per hop (site layout dependent)
System capacity: Up to 64 devices per site code as standard
Enhanced capacity: Expandable up to 192 devices on Camelott-configured systems
Power supply: Long-life battery set (no mains required)
Operation: Fully independent of Wi-Fi, Ethernet or 4G networks
Use case: External / outdoor environments linked to an indoor lockdown system

Key Technical Details in Everyday Terms

In plain language, the External Slave Sounder gives you:

A tough, weather-resistant housing suitable for external mounting.
Wireless communication with your Master Call Point and internal sounders.
Clear, loud outdoor audio and visual alert when lockdown is triggered.
Battery power so it continues to operate during mains failures.
No dependency on your existing IT, Wi-Fi or phone system.

Installation and Setup

Installation is designed to be as simple as possible for existing buildings:

Supplied with installation guidance and recommended mounting heights.
Mounted to an external wall or structure in the required coverage area.
No new mains wiring needed – unit runs on internal batteries.
Configured to match your site code and link with your Master Call Point and other devices.

Supplied, Installed & Supported by Camelott® UK

Camelott provides, installs and supports wireless lockdown systems for schools, multi-academy trusts, SEND environments, and theatre & venues with 200+ public capacity.

We offer:

Professional installation (optional)
On-site staff training
Site surveys for multi-building layouts
Annual safety & system checks
Expansion up to 192 wireless devices

Large Installations & Multi-Block Lockdown Planning

If your site includes multiple buildings, SEND units, performance halls, large outdoor areas or over 200 members of the public on site at once, Camelott® can carry out a full RF coverage survey & lockdown deployment assessment.

Multi-block RF range audit & beacon/sounder placement mapping
Signal checks for corridors, SEND rooms, drama theatres & sports wings
Full detailed proposal with recommended device locations
Future expansion planning (up to 192 linked devices)
Discussion on likely threats and activation points
Monitoring equipment options to keep the system live and supervised
Email and text alert options for key contacts
Nationwide UK coverage, including England, Scotland and Wales

Types of Organisations We Support

Camelott® provides lockdown safety systems for a wide range of public-facing and duty-holding environments,
including locations required to consider Martyn’s Law (Protect Duty) or where
200+ members of the public may be present at one time.

Primary & Secondary Schools
Multi-Academy Trusts (MATs) & multi-block campuses
Nurseries & Early Years settings
SEND schools, assisted learning centres & inclusion units
Universities, colleges & FE/HE buildings
Theatres, arts venues & live performance spaces
Sports centres, leisure complexes & indoor arenas
Public libraries, civic buildings & council estates
Hospitals, clinics & healthcare wings
Religious buildings & faith-based community sites
Museums, exhibition halls & heritage visitor sites
Hotels, conference facilities & large hospitality spaces
Tourist attractions & large public visitor environments
Police, emergency hubs & responder-linked facilities
Office HQs, multi-tenant buildings & business parks
Warehouse, logistics & light industrial units
Transport hubs (indoor waiting/concourse spaces)
Community centres & charity venues
Event spaces, halls & private venue hire locations

Request a full site survey, installation plan and RF test visit using the secure form below:

Request a Site Survey / Large Installation Quotation

Related Products

Policy & Compliance / Lockdown Information

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External Slave Sounder