If you look down at "similiar threads" you sill see some1 selling the same alarm at $700, and some1 else selling a shitter viper alarm at $600..
$500 is an absolute bargain..
Some1 buy it please..
I can also get additional modules if you need, like microwave sensors, digital tilt sensors, EL lights, etc. etc. all at cheap prices if you get this alarm.
Thanks..
Greg