Today was my first day of using this product after my bike was stolen on 5th Ave over the weekend. After watching video footage of his theft, I'm pretty sure he had that alarm. was on my bike, I would still have it. It's lightweight, super easy to use, and loud as hell. If you park your bike in a densely populated area, I can't believe a thief would continue tinkering with the bike after the alarm went off. Not to mention the bike doesn't roll with it. Great investment for the price and what it does.