Ajax StreetSiren White Front View SD421W
Ajax StreetSiren White Front View SD421W
Ajax StreetSiren White 3-Way View SD421W
Ajax StreetSiren White Side Angle View SD421W
Outdoor Application SD421W

Ajax StreetSiren White

R 3,107.00 Incl. VAT
R 0.00 Incl. VAT

Available to order online or collect at 6 Cosmic Street Linbro Park, Sandton, 2090 (Map)


Spec Data Sheet Button

The Ajax StreetSiren White is a wireless siren suitable for both outdoor or indoor installation. The StreetSiren notifies of detector activation with an audible alarm and LED light to scare off intruders and alert neighbours.

The buzzer can be set to generate sound from 85 to 113 dB for an adjustable period from 3 seconds to 3 minutes, or it can be completely silent and respond only with LED indication.

Please note: StreetSiren operates within the Ajax system, connected to the hub via the protected Jeweller protocol.

Compatible with All Ajax hubs and radio signal range extenders

Product Code: 7830.07.WH1


  • Wireless siren with LED frame and piezoelectric buzzer
  • Outdoor and indoor installation
  • Built-in battery lasts up to 5 years (Optionally a 12V DC power supply can be connected)
  • Communication range of 1500m (in an open space/line of sight)
  • Adjustable sound level of 85 – 113 dB at a distance of 1 m
  • Adjustable alarm time of 3 seconds to 3 minutes
  • Indicates armed/disarmed mode
  • Recommended installation height — 2.5 meters and more
  • Tampering resistant
  • IP54 dust and moisture protection
  • Set up via the Ajax app for iOS, Android, macOS and Windows
  • System notifications delivered via push notifications, SMS and calls (if activated)
  • Quick and Easy installation



The Ajax StreetSiren comes ready to operate straight out the box.

The battery is pre-installed, so there is no need to disassemble the detector.

With one click, it can be connected to the hub in the mobile application. It can be mounted on the SmartBracket in just a few minutes.



Compatibility All Ajax hubs and radio signal range extenders
Classification Light and sound radio channel security sounder
Type of detector Wireless
Installation method Indoors/Outdoors
Type of notification Sound/light
Alarm volume From 85 to 113 dB at a distance of 1 m (Adjusted in the Ajax app)
Alarm length From 3 s to 3 min (Adjusted in the Ajax app)
Indication of armed/disarmed status Yes
Indication of entry/exit delays Yes (With firmware version 3.50 and higher)
Chimes Yes (With firmware version and higher)
Alarm signal delivery time 0.15 s
Power supply 4 x CR123A batteries, 3V
Battery life Up to 5 years
Mains supply DC 12 V±20%
Communication range with central unit Up to 1,500 m in an open space
Two-way communication between devices Yes
Operating frequencies 868.0-868.6 MHz
Self-adjusting RF output power Up to 25 mW
Block encryption based on AES algorithm Yes
Device polling period 12−300 s
Operating temperature range 25°С to +50°С
Operating humidity Up to 95%
Protection class of body IP54
Protection against fraud Yes
Jamming detection Yes
Tamper-resistant Yes
Remote setting and testing Yes
Certification Grade 2, CE
Product Dimensions 200 mm х 200 mm х 51 mm
Product Weight 528g
Packaging Dimensions 218 mm x 209 mm x 68 mm
Mass of unit packed 925g
Warranty 24 months limited Manufacturer’s warranty. The warranty does not cover batteries.



1 x Ajax StreetSiren White

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