125KHz T5577 Writable Rewritable RFID Coin Card & Keyfob 5pk
125KHz T5577 Writable Rewritable RFID Coin Card & Keyfob 5pk
125KHz T5577 Writable & Rewritable RFID Coin Cards & Keyfobs – 5-Pack
Upgrade your access control setup with this versatile 5-pack of 125KHz T5577 Writable RFID Coin Cards and Keyfobs. Compatible with most 125KHz RFID readers and card writers, the T5577 chip allows you to read, write, and rewrite credentials multiple times — making these tags ideal for door entry systems, time-attendance terminals, gym lockers, parking systems, and custom DIY security projects.
Built with a copper coil antenna embedded in a durable PVC housing, each card and keyfob is compact, lightweight, and easy to carry on a keyring or wallet. The coin-card form factor slips effortlessly into any standard card slot, while the keyfob attaches to any keychain for on-the-go convenience.
Key Features
- Chip: T5577 — fully writable and rewritable 125KHz RFID chip
- Frequency: 125KHz (compatible with EM4100, HID, and other common 125KHz formats after writing)
- Antenna: High-quality copper coil for reliable read range
- Material: Durable PVC construction — slim, lightweight, and splash-resistant
- Form Factor: Coin card + keyfob — two convenient carry options included
- Pack Size: 5 pieces (mix of coin cards and keyfobs)
- Use Cases: Door access control, time-attendance systems, locker management, parking systems, RFID duplication & testing
Why Choose T5577 RFID Tags?
The T5577 chip is one of the most flexible 125KHz RFID chips available. Unlike read-only EM4100 tags, T5577 cards can be programmed and reprogrammed to emulate a wide range of 125KHz credentials. This makes them a favourite among system integrators, IT professionals, hobbyists, and anyone who needs flexible, reusable RFID credentials.
What's in the Box?
- 5 × 125KHz T5577 RFID Tags (coin cards and/or keyfobs)
For more information on RFID technology and access control standards, visit the NIST Guidelines for Securing RFID Systems.
Frequently Asked Questions
Q: What devices are compatible with 125KHz T5577 RFID coin cards and keyfobs?
A: T5577 RFID tags are compatible with most standard 125KHz RFID readers, door access control panels, time-attendance terminals, and RFID card writers/duplicators that support the 125KHz frequency. Once written, they can emulate popular formats such as EM4100 and HID.
Q: Can I rewrite the T5577 RFID card multiple times?
A: Yes — the T5577 chip is fully rewritable, meaning you can overwrite the stored credential data multiple times using a compatible 125KHz RFID writer or duplicator. This makes it an excellent choice for testing, development, and flexible access control deployments.
Q: Are these RFID tags waterproof?
A: The PVC housing and embedded copper coil antenna provide solid splash and moisture resistance for everyday use — including outdoor keyfob applications. They are not designed for full submersion.
Q: What is the difference between the coin card and keyfob included in this pack?
A: Both contain the same T5577 125KHz RFID chip. The coin card is credit-card sized and slim enough to fit in a wallet or card holder, while the keyfob features a ring attachment for carrying on a keychain — giving you two convenient form factors in one pack.