STI ED-55 Review – Safety Technology Rex Plus II Electronic Watchdog Alarm


Do you need a dog looking after your house without actually owning a real dog? It does not need to sleep, no need foods/water and it protects your house 24×7 without failure. Today we are reviewing the STI ED-55 Rex Plus II electronic watchdog alarm. This STI ED-55 alarm is the innovative ways to detect intruders or burglars. It starts to barks like a ferocious dog when it detects movement within the monitoring range of the alarm.

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  • Sounds like a vicious barking dog
  • Detection range 26 feet
  • Detection angle 150 degree
  • Different barking frequency base on movement range detected


  • NA


The Safety Technology ED-55 Rex Plus II electronic watchdog alarm has a detection range up to 26 feet but the range will reduce if there is obstructions in between. The detection angle of the Rex II alarm is tested inside the 150 degree range.

It starts to make dog barking sound once movement detected. The frequency of the barking sound become higher when the movement detected gets closed. The sounds will only turn off when there is completely no movement in the monitoring range.

This Safety Technology ED-55 barking dog alarm has a few different built-in voice messages or prompts, such as :

1) “Warming up” – during the time the alarm is starting up
2) “Armed” – a) after warm up cycle is complete and the electronic alarm is starting the monitoring function b) when the electronic dog alarm is coming out of mute mode
3) “Growl sound” – this is use for dog sounds only, when STI ED-55 is in mute mode
4) “Please replace batteries” – when detected batteries is low during power up or after mute button is pressed


STI ED-55 ReviewOther than the vicious dog sound, the STI ED-55 also has a siren sound or greeting announcer sound. It only needs a standard 110VAC electrical outlet or six c batteries to operate. Thus you are still guaranteed a “guard” for your house if there is power failure as the alarm can runs on batteries. On top of that, the water resistant flip top can also provide convenient access to the controls.

As a conclusion, this STI ED-55 electronic watchdog alarm do exactly what it does best, protects your house 365 days a year and deter intruders from entering your house. Sometime it is better than owning a real dog as the ED-55 alarm’s electronic radar eyes allows it to “see” through thick doors, walls and glass.

For more information about STI ED-55 Rex Plus II Electronic Watchdog Alarm CLICK HERE.

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Rating: 2.5/5 (35 votes cast)
STI ED-55 Review - Safety Technology Rex Plus II Electronic Watchdog Alarm, 2.5 out of 5 based on 35 ratings

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