I slapped these bright yellow stickers on my car windows a few months ago, and honestly? They've become my favorite low-budget security upgrade. The bold 'GPS TRACKING' warning looks legit enough to make potential thieves think twice.

What surprised me most was how well they stick - through car washes, heavy rain, and even during a recent road trip through varying temperatures. Unlike cheaper decals I've tried, these don't peel at the edges or fade to a pale ghost of their former selves.

Pro tip: Apply them slightly higher on side windows rather than windshields. That way you avoid the 'white backing' visibility issue some reviewers mentioned while maintaining the deterrent effect from outside.

Are they foolproof? Of course not. But for less than $10, they've given me peace of mind when parking in sketchy areas. Plus, I love that the pack includes enough stickers to strategically place on multiple vehicles - my daily driver AND my weekend project car both got the protective treatment.

The only downside? They adhere so well that removing them requires some elbow grease (a razor blade and goo gone did the trick when I needed to reposition one). But honestly, that's a good problem to have for an anti-theft product meant to stay put!