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The Ajax StreetSiren is a wireless outdoor siren that alerts you and your neighbourhood to danger through powerful sound and bright LED flashing. Installed outside your property, it activates when detectors in your Ajax system are triggered, serving as both a deterrent to intruders and a clear signal to those nearby. The siren is built to withstand dust, hail, and rain, and its sound level and alarm duration can be customised directly through the Ajax mobile app.
| Alarm length | Adjustable, 3−180 s |
| Alarm Signal Delivery Time | 0.15 |
| App Control | Yes |
| Battery life | 5 Years |
| Detection Range | 1500 m |
| Dimensions | 200 х 200 х 51 mm |
| Indication of armed/disarmed status | Yes |
| Jamming Detection | Yes |
| Power Supply | 3 V |
| Siren Included | Yes |
| Siren Type | Outdoor |
| Sound volume level | Adjustable, 81−113 dB at a distance of 1 m |
| Tamper Resistant | Yes |
| Type of notification | Sound/light |
| Operating Temp (Min) | -25 °C |
| Operating Temp (Max) | 50 °C |
| Warranty | 2 years |
| MPN | 38178.07.WH1 |
| Model number | SD421 |