Review on Dowco Guardian 26038-00: Enhanced Motorcycle Cover Security Alarm System for Optimum Theft Protection by Vincent Pavelko

The price alone is worth it. The alarm is loud enough for you or your neighbors to hear, and loud enough to make a would-be thief uncomfortable if they actually stay close while the thing roars. Tip: Don't forget you've got this thing, because while it's easy to mute it when you turn it on on purpose, the biggest problem is turning it off when you need to get the alarm out of your head. Close the lid AND look for the severed pin (it's on a small string so it'll be noticeable), but I don't think the thief would have a chance of figuring out how to pull it off fast enough if they didn't know that he is there.