Rewritable RFID Keyfob 13.56MHz UID & 125KHz T5577 Chip
Rewritable RFID Keyfob 13.56MHz UID & 125KHz T5577 Chip
Upgrade your access control setup with this versatile Rewritable RFID Keyfob, compatible with both 13.56 MHz (UID/IC) and 125 kHz (T5577/ID) frequencies. Compact, lightweight, and built from durable ABS material, this dual-frequency keyfob is engineered for everyday convenience — whether you're managing building entry, office doors, or smart lock systems.
Why You'll Love This RFID Keyfob
- Dual Frequency Support: Works with both 13.56 MHz (IC/UID changeable) and 125 kHz (T5577 ID) RFID systems — one keyfob for maximum compatibility.
- Rewritable & Changeable UID: Easily clone or reprogram the chip to match existing cards or fobs using a standard RFID read/write device.
- 1KB Memory Capacity: Ample onboard storage for access credentials and custom data.
- Compact & Portable Design: Small, lightweight keyfob form factor — attaches easily to your keyring for everyday carry.
- Durable ABS Construction: Impact-resistant ABS housing is built to handle daily use and splash exposure.
- Passive Power Supply: No battery required — powered wirelessly by the RFID reader for reliable, maintenance-free operation.
- Great for Cloning & Testing: Ideal for locksmiths, security technicians, hobbyists, and anyone needing flexible RFID credential management.
Product Specifications
- Working Frequencies: 13.56 MHz (UID changeable IC) & 125 kHz (T5577)
- Memory: 1KB
- Power Supply: Passive (no battery — reader-powered)
- Material: ABS plastic
- Form Factor: Keyfob
- UID: Rewritable / Changeable
Common Uses
- Cloning existing RFID access cards or fobs
- Building & office entry systems
- Smart door lock compatibility
- Security testing and RFID development
- Keyring access credential replacement
For general information on RFID technology and wireless communication standards, visit the NIST Radio Technology Division.
Frequently Asked Questions
Q: What RFID frequencies does this rewritable keyfob support?
A: This keyfob supports two frequencies: 13.56 MHz (UID-changeable IC format, compatible with many modern access control systems) and 125 kHz (T5577 chip, compatible with a wide range of legacy ID-format readers). This dual-frequency capability makes it highly versatile for cloning and credential management.
Q: Can I clone my existing access card or fob onto this keyfob?
A: Yes — the UID is rewritable and changeable, meaning you can use a compatible RFID read/write device (such as a Proxmark or ACR122U) to copy the data from an existing card or fob onto this keyfob. Always ensure you have the proper authorization to clone any credential before doing so.
Q: Does this RFID keyfob require a battery?
A: No battery is required. This keyfob uses passive RFID technology — it is powered entirely by the electromagnetic field generated by the RFID reader, making it completely maintenance-free.
Q: What is the memory capacity of this keyfob chip?
A: The chip has a 1KB (1 kilobyte) memory capacity, which is sufficient for storing standard RFID access credentials and sector data used in most common access control applications.