Let me start by saying these $10 dummy alarm lights surprised me. As someone who parks on sketchy downtown streets, I needed visible theft deterrents without wiring a real alarm system. After 3 months of testing, here's the real deal.

The Good: These solar-powered blue LEDs are BRIGHT at night - like 'whoa, is that a Viper alarm?' bright. The slow blinking (about once per second) does look legit from a distance. I stuck one near my rearview mirror, and even Uber drivers have asked if I had an aftermarket security system installed!

The Reality Check: The included adhesive is garbage - mine fell off within a week. Do yourself a favor and use 3M Velcro strips instead (like several reviewers suggested). Also, the 'solar-powered' claim is half-true - mine works best when I occasionally give it direct sunlight by placing it on the dashboard.

Pro Tip: These work best as psychological deterrents. One night I actually watched from my apartment as a would-be thief walked up to my car, saw the blinking light, and moved on to an unprotected vehicle down the block. That alone made these worth every penny.

Who Should Buy These: If you want visible theft prevention for <$20 and don't mind occasionally repositioning them for sunlight, these deliver surprising value. Just don't expect Fort Knox-level security.