YARONGTECH 125khz RFID Writable rewritable T5577 fob tag for RFID Writer (Pack of 10) (Black)

I was surprised that they were completely not-programmed when they arrive, I needed to program them first before they would read. But they're working great. I was able to clone multiple kinds of tags onto them, and re-program at my leisure.

These work perfectly for both 125khz HID & ID cards copying, some other makes don't so it's lucky dip on that front. These are definitely the ones to get 100% recommended! 😎👍

Fake specifications. Not programmable to 12.5 mhz or 13.2 mhz devices. Probably just a plastic case with nothing inside. Dont buy and waste your time and money

Fue muy fácil grabar la información qu requiero y por si tamaño no es estorboso y lo puedo utilizar en lugar de una tarjeta

I've been really impressed with these T5577 rewritable RFID fobs. I picked up the 10-pack to use with a handheld RFID writer, and every single tag has worked flawlessly so far. I’ve used them in a few real-world scenarios: Made a backup fob to keep hidden in my truck just in case I lock myself out or misplace the original. Cloned a pet-sitter fob while I was on vacation so they could access my building without needing to hand over my main one. Copied a pool access fob for my friend group, so we can all get in without having to juggle the original back and forth. Cloning and rewriting have both worked without issue. I've tested re-writability multiple times on the same fob, and it’s held up perfectly each time—no failures, no weird behavior. The chips respond consistently, and I haven’t had a single dud in the pack. Heads-up for first-time users: These come blank, so you must have a compatible 125kHz RFID writer to program them. They won’t scan or read until they’re written to. That’s not a flaw—it’s just how the T5577 chip works. Also, don’t expect these to work with systems like Onity or Proxmark3 RDV4; they’re great for common 125kHz formats like EM4100 and HID. The fobs themselves are durable with a solid keyring hole, and the black color looks clean and low-profile. At under a dollar per fob, this is one of the best values I’ve found for RFID work. Highly recommended for DIY security backups, access sharing, and general RFID cloning projects.