SimpliSafe 105dB Auxiliary Siren - Loud Indoor/Outdoor Alarm

In this review the SimpliSafe 105dB Auxiliary Siren is evaluated for homeowners and renters who want a simple way to amplify alarm coverage and deter intruders. The bottom line: it is a straightforward, high-impact add-on for the SimpliSafe Gen 3 system that delivers a very loud, attention-grabbing 105dB alarm and flexible mounting options. Installation is intentionally simple, and its weather-resistant design makes it useful for sheltered outdoor locations as well as indoor rooms that need extra alerting.

Key Features

• Auxiliary siren: Provides an additional loud alarm source to scare off intruders and draw neighbors or responders to the property.
• Loud 105dB sound: The high sound level is designed to stop intruders in their tracks and extend audible notification around the house.
• Weather-resistant design: The siren can be installed in sheltered outdoor areas or indoors without worry about brief exposure to the elements.
• Simple set up: Peel-and-stick mounting or included hardware allows fast installation and pairing through the SimpliSafe App.
• Long-lasting battery: Battery operation avoids wiring and keeps the unit active during power outages for reliable coverage.
• Gen 3 compatibility: Built to work with the SimpliSafe Gen 3 home security system for seamless integration.

Who It's For

This siren is best for homeowners, renters, and small property owners who already use the SimpliSafe Gen 3 system and want louder, more distributed alarm coverage without running wires. It is useful where the base station or existing devices do not provide sufficient audible reach, such as larger homes, multi-level houses, or properties with detached areas that need notification.

Those who should look elsewhere include people who need a fully weatherproof outdoor siren for exposed locations or a hardwired alarm with continuous power; this unit is weather-resistant for sheltered placement and relies on battery power, which may not suit every outdoor installation or preference for wired setups.

Pros & Cons

Pros

• Very loud 105dB output increases the chance of scaring off intruders and alerting neighbors.
• Easy installation options-peel-and-stick or included hardware-make it quick to add coverage.
• Weatherized for sheltered outdoor use expands placement choices beyond interior rooms.
• Designed for straightforward integration with SimpliSafe Gen 3 systems for reliable connectivity.

Cons

• Connectivity and functionality received mixed reports from some users, so placement and pairing may require troubleshooting.
• Battery operation means eventual replacement and may not suit users who prefer a hardwired siren.

Specifications

Product type	Auxiliary siren
Sound level	105dB
Use	Indoor / sheltered outdoor
Mounting	Peel-and-stick or included hardware
Power	Battery (long-lasting)
Compatibility	SimpliSafe Gen 3 home security system

Our Verdict

The SimpliSafe 105dB Auxiliary Siren is a practical, value-oriented add-on for Gen 3 users who need louder, more distributed alerts. It combines a very loud alarm, easy installation, and weather-resistant construction for sheltered outdoor spots, making it a sensible upgrade where wiring is impractical; buyers who need a fully outdoor-rated or hardwired unit should consider alternatives.

Frequently Asked Questions

Can this siren be used outdoors?
The unit is weather-resistant for installation in sheltered outdoor locations but is not intended for continuous exposed outdoor mounting.

How is it installed?
Installation uses peel-and-stick adhesive or the included hardware, and the siren is paired through the SimpliSafe App.

Will it work with my system?
The siren is compatible with the SimpliSafe Gen 3 home security system and is designed to integrate with that platform.