Wireless outdoor siren that pairs 113 dB audio with a high-intensity flashing LED — sounding the alarm and identifying its source for neighbors, passers-by, and arriving security patrols. StreetSiren mounts on building facades, garden walls, and warehouse exteriors as the visible, audible escalation step: while indoor detectors and HomeSirens alert occupants, StreetSiren tells the neighborhood something is wrong and signals where to look. The siren responds to any alarm event from the Ajax system — intrusion, fire, glass break, panic — with sound level, alarm duration (3 seconds to 3 minutes), and tone all configurable per scenario in the Ajax app, so a perimeter breach can sound different from a fire alarm without buying separate hardware. Tamper switches on both the front cover and the mounting bracket fire instant alarms if anyone tries to silence or remove the unit, and the LED doubles as an armed/disarmed status indicator visible from approach distance. It pairs with the Ajax Hub 2 over the encrypted Jeweller radio protocol at distances up to 1,500m line-of-sight, runs up to 5 years on four CR123A batteries, with frequency-hopping and chip-level authentication blocking jamming and signal replay. IP54 rated against dust and water splash, operates from -25°C to +50°C, up to 10 sirens per hub. Ideal for villa facades, warehouse perimeters, retail shopfronts, industrial yards — anywhere the alarm needs to reach beyond the property line and the deterrent needs to be visible from the street.