I recently got my hands on these UID writable key fobs, and I must say, they do what they promise. The ABS material feels sturdy, and I’ve accidentally dropped them a couple of times—no cracks or issues. They’re definitely waterproof too; I tested one under running water, and it still worked perfectly afterward.

Writing and rewriting these tags is a breeze. I’ve used them to clone my apartment access card and a parking tag, and they’ve held up well over multiple rewrites. The compatibility with Proxmark3 and Flipper is a huge plus for tinkerers like me. However, as noted in some reviews, they don’t play nice with the Android MCT app, which was a slight bummer.

One thing to watch out for: modern NFC systems might flag these as counterfeit due to the 'Chinese magic wakeup' command. I ran into this at my gym’s access system—it rejected the cloned tag outright. For high-security setups, you might need to shell out for Gen2 or GDM tags. But for everyday use like apartment or office access, these are solid and affordable.