Loud, bright, branded. Visible deterrent at the door.
A wireless outdoor siren with a 113dB sounder, LED strobe, full sabotage protection, and an optional custom-branded faceplate. Mounted on the building exterior, it serves both as visible deterrent and audible alert during alarm activations.
Free site survey · Fixed-price quote · Same-week installation across London. No-obligation, no high-pressure sales — just a certified Ajax engineer assessing your property and recommending the right system.
Takes 60 seconds. No obligation.
Statistics consistently show that visible alarm sirens deter most opportunistic intruders. Combined with internal sounders and photo verification, StreetSiren Plus G3 provides three layers of response: deterrence, alert, and verification.
Loud enough to be heard across an entire street. Configurable duration (typically 90 seconds in the UK to comply with noise regulations) with automatic reset.
Bright LED strobe activates alongside the sounder, providing visual indication for emergency services and alerting neighbours even if they can't hear the sound.
Optional faceplate with installer branding. We can supply with SatFocus Security branding — a permanent visible reminder of your alarm provider for support and maintenance.
Tamper switches detect any attempt to remove or open the siren. Cutting wires (where applicable) triggers an immediate tamper alarm — the wireless connection has no wires to cut anyway.
Internal lithium battery provides up to 4 years of operation. Battery health monitored — system alerts when battery needs replacement, well before failure.
Rated for outdoor use in all UK weather. Operates from -25°C to +50°C. Sealed against dust, splashes, and driving rain.
Optimal mounting balances visibility (deterrence value) with sound projection (alert effectiveness). We assess location during site survey to maximise both.
Mounted at first-floor level on the front of the house. Highly visible from the street, sound projects across the front garden, hard to reach for tampering.
Mounted prominently above the customer entrance. Visible to anyone considering targeting the property. Custom branding doubles as marketing for the security company.
Two or more sirens — one front, one rear. Ensures audibility from any approach direction and provides redundancy if one is compromised.
Lower-profile mounting on side walls or coach lights for properties where front-facade installation isn't permitted. Still effective for sound, less obtrusive visually.
Complete technical specifications. Specs may be updated by Ajax through firmware revisions — confirm latest at site survey.
| Sound | |
|---|---|
| Sound output | 113 dB at 1 metre |
| Frequency pattern | Sweep tone (configurable) |
| Duration | Configurable 0-180 seconds (UK typical: 90s) |
| Internal piezo | Independent of strobe circuit |
| Light | |
| Strobe type | LED, multi-direction |
| Activation | Sounds with siren or alone |
| Visibility | Designed to be seen at distance during day or night |
| Communication | |
| Wireless protocol | Jeweller |
| Range to Hub | Up to 1,500m line of sight |
| Encryption | AES with floating key |
| Tamper alert | Wall-removal and case-open detection |
| Power | |
| Battery type | Internal lithium pack |
| Battery life | Up to 4 years |
| Backup behaviour | Continues to alert during Hub power loss within battery life |
| Environment | |
| IP rating | IP54 weatherproof |
| Operating temperature | -25°C to +50°C |
| Mounting | Wall-mounted with theft-resistant fixings |
| Customisation | |
| Faceplate | Default Ajax branding or custom installer branding |
| Colour | White (standard) |
| Logo | Custom installer logo on demand |
Indicative installed pricing based on typical UK market conditions. Final price confirmed at survey.
Includes installation, mounting at high level (typically with access ladder), system pairing, and configuration. Custom branded faceplate adds £25-£50 depending on artwork preparation needs.
Get Exact QuoteYes — that's part of its purpose. UK noise regulations limit alarm duration (typically 90 seconds maximum continuous siren). Configured correctly, StreetSiren Plus G3 complies. Most neighbours appreciate visible/audible alarms because they're effective deterrents that reduce crime in the area.
Yes — for two reasons. Operationally, it tells residents and staff who installed and maintains the system, useful for ongoing support and faults. Commercially, the visible branding is permanent advertising for SatFocus on every property — neighbours see it and consider the same installer for their own homes.
Several protections. Tamper switches: any attempt to remove or open the case triggers an immediate alarm. Wireless: there are no cables to cut. High mounting: typically out of reach without ladders. Battery-powered: pulling fuses or shutting off mains has no effect.
113 dB is roughly equivalent to a chainsaw at 1m or a rock concert. Inside the property, it's deafeningly loud — most intruders flee within seconds. Outside the property, it's clearly audible across multiple houses, alerting neighbours who may witness the incident.
Yes — Hub G3 supports multiple StreetSirens plus indoor sirens (HomeSiren) on the same system. For larger properties or commercial sites we typically install 2-4 outdoor sirens covering different sides of the building, plus 1-2 indoor for additional internal volume.
For most freehold homes in the UK no permission is needed. For listed buildings, conservation areas, leaseholds, or rented properties, written permission from the landlord/freeholder/council may be required. We assess this during site survey and advise.
Products typically installed alongside StreetSiren Plus G3 in a complete Ajax system.
Most break-ins are opportunistic — visible alarm equipment shifts the target elsewhere. Free survey to plan optimal siren placement on your property.
Need this installed properly?
SatFocus Security has completed 3,000+ installations across London. DBS-checked engineers, 12-month workmanship warranty, free site survey — no obligation.
