Just got these RFID cards to play with my Flipper Zero and wow, they're actually pretty neat!

The dual frequency thing works as advertised - copied my office key fob in seconds. The plastic feels sturdy, not some cheap flimsy stuff.

What surprised me was how quick the read/write is. Like literally instant when I wave it near my Flipper. The keychain hole is a nice touch too.

For the price, these are perfect if you're into hacking around with access systems or just want backup copies of your cards. No issues with quality so far after a week of testing.

Only thing - the sensing distance is indeed short (2-10mm), but that's fine for most uses. Would definitely buy again!