It's pretty good IMO. I bought the two way pager alarm system after my car got broken into. It has a mile range. I work in the third floor of my building and park in the parking garage which is about 40 yards from the building and still get signal. Plus you can adjust the sensitivity for vibrations if you park on the street and don't want it going off for people with loud systems or dumptrucks.
The only problem I have is that the battery tends to run out quick on the pager [I keep it on vibe + alert though], and the blue light that flashes when it's armed is too bright [IMO it would probably cause someone to look in when they otherwise wouldn't, and my in dash DVD isn't removable]
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