Scorpio is expensive, also, doen't work that well. It's supposed to be GPS compatible, but I've seen one on a bike, & it wouldn't let the bike start or it would kill the battery. So it was ripped out.

I have the Scorpio on my bike, & even though there is no led, it works pretty well. It comes with a 2-way pager, distance is ok, but I set the alarm as soon as I get off the bike. Comes standard with tilt & shock sensor. Optional are perimiter & ignition kill...I also have the ignition kill which work. On EFI, it will cut off the fuel to the motor, on carbs, it just kills the start button totally. The perimiter sensor gets annoyin if too sensitive, will detect anything movin. But the alarm itself is pretty loud, & will go off if someone moves it (you can set up your pager to vibrate & beep). You can also hook up the alarm so your lights flash as the alarm goes off, or have it on silent so just your pager goes off. It's all on what you want to do. Good investment for extra security...