HOMESIREN

The AJAX HomeSiren is a compact wireless indoor siren that delivers loud acoustic warnings (81-105 dB at 1m) during alarms to deter intruders and notify occupants, with customizable volume levels and duration (3-180 seconds) adjustable via the Ajax app.
It features a built-in LED indicator that blinks when armed/disarmed and supports an external LED connector, using Jeweller protocol for reliable two-way communication up to 2000m in open space with up to 5-year battery life.
Key Specifications
Feature
Specification
Alarm Volume
Adjustable 81-105 dB @ 1m (3 levels) 
Communication
Jeweller 868 MHz (up to 2000m open space) ​
Battery
2× CR123A 3V (up to 5 years) ​
Features
LED indicator, external LED connector, chime, tamper protection 
Alarm Duration
3s to 3min (up to 15min on newer firmware) ​
Protection
IP50 indoor; 0°C to +40°C ​
Dimensions
75 × 76 × 27 mm; ~50g ​
Compatibility
All AJAX Hubs + ReX ​