Last updated: 09/03/2020

Ajax Systems
CROW Wireless
Electronic Components
Manuals & FAQs
Software updates
3D Printing / Design
About us








SMS Alert app


IOs Alternative




















Including VAT.

Prices may vary.



Extension Aerials


Shop Online:

Magnetic Antenna

Patch Antenna

Converter Cable

Magnetic Antenna

2m Aerial with magnet plus UFL converter –

Converter – (only necessary if antenna is purchased afterwards)


Patch Antenna

Patch Antenna with self-adhesive tape – 

Converter –  (only necessary if antenna is purchased afterwards)






Upgrade/Replacement Module

Cellphone PCB 




Shop Online

A new PC Board can be bought to replace older units that used a cellphone.

The PC Board plugs in where the cellphone plugged in.

All functionality and programming stays the same.

Size = credit card.


Version information







Pepper Gas Dispenser


Shop Online

Requires 12V pulses to spray.

60 gram / 100ml canister included.

Robust and suitable for outdoor use.

Very little movable parts.

Dimensions: 50 x 50 x 340 mm.  

Doesn’t work on its own; needs to be connected to an SMS Alert.  










Pepper Gas Cans


Shop Online

Shop Online

Shop Online

Shop Online

Shop Online

Pepper Gas Can: 40 gram = R160 (for self-defense or to refill our SMS Alert Portable Stand-Alone Alarm).

Pepper Gas Can: 60 gram = R170 (for self-defense or to refill our Pepper Gas Dispenser).

Demo can: 40 gram = R100 (for testing purposes - perfumed gas)

Demo can: 60 gram = R110 (for testing purposes - perfumed gas)

Neutralizer can: Only 60 gram = R170  


Pepper Gas Can on



Shop Online

Self-defense pepper gas cans.

Includes key chain, which can be attached to your keys for quick use.

Size: 95mm x 23mm.





On Request

Keypad that can be used for SMS Alert 9 Alarm Plus.

2 separate relays: control 2 doors/1 door & duress.

Relay 1: Up to 1 000 codes.

Relay 2: 10 Codes.

Blue Backlit keys.

12-24 VAC or VDC.

Weatherproof: IP65 Rating.

Dimensions: 118 x 74 x 23 mm.  


Water Level SMS Alert


R2 400


Tank Sensor = R465

Or, Floor Sensor = R190

Option 1: SMS you when the water level in a tank is too high or too low, or a certain level.

Option 2: SMS you when water is flowing into a room, e.g. a server room.  


Other applications : Jar / bucket water level measurement, 

see picture below (max 30cm deep)

Product can be customized to fit you specific application.



Digital Timer Module




Shop Online

Power input range: 10V – 14 V DC

Versatile timer module can be set with 9 different applications:  

- 1sec - 24Hours Timer  

- Auto door closure  

- Guard awake timer  

- Pulse stretcher  

- Counter  

- Count down trigger  

- False alarm prevention  

- Momentary to Latching  

Trigger input: Positive/Negative  

Reset input: Normally open potentially free  

Relay output load @ 12V DC: 1 Amp  

Dimensions: 52x65mm  




Shock Sensor 



Shop Online

The VIB-2000 is a wired vibration sensor used for detecting mechanical impacts, such as hammer, drill, explosive, diamond drills and hydraulic pressure.

It is designed for usage with vaults, safes and ATM machines, windows/door frames, etc.






35*6mm 2g GSM Patch Antenna





35*6mm 2g GSM Patch Antenna


Solar Regulator



Shop Online

15 Amp, 12V to 24V regulator.