{"product_id":"rewritable-rfid-keyfob-13-56mhz-uid-125khz-t5577-changeable-chip","title":"Rewritable RFID Keyfob 13.56MHz UID \u0026 125KHz T5577 Chip","description":"\u003cp\u003eUpgrade your access control setup with this versatile \u003cstrong\u003eRewritable RFID Keyfob\u003c\/strong\u003e, compatible with both \u003cstrong\u003e13.56 MHz (UID\/IC)\u003c\/strong\u003e and \u003cstrong\u003e125 kHz (T5577\/ID)\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch2\u003eWhy You'll Love This RFID Keyfob\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Frequency Support:\u003c\/strong\u003e Works with both 13.56 MHz (IC\/UID changeable) and 125 kHz (T5577 ID) RFID systems — one keyfob for maximum compatibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRewritable \u0026amp; Changeable UID:\u003c\/strong\u003e Easily clone or reprogram the chip to match existing cards or fobs using a standard RFID read\/write device.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1KB Memory Capacity:\u003c\/strong\u003e Ample onboard storage for access credentials and custom data.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable Design:\u003c\/strong\u003e Small, lightweight keyfob form factor — attaches easily to your keyring for everyday carry.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable ABS Construction:\u003c\/strong\u003e Impact-resistant ABS housing is built to handle daily use and splash exposure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePassive Power Supply:\u003c\/strong\u003e No battery required — powered wirelessly by the RFID reader for reliable, maintenance-free operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Cloning \u0026amp; Testing:\u003c\/strong\u003e Ideal for locksmiths, security technicians, hobbyists, and anyone needing flexible RFID credential management.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Frequencies:\u003c\/strong\u003e 13.56 MHz (UID changeable IC) \u0026amp; 125 kHz (T5577)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMemory:\u003c\/strong\u003e 1KB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e Passive (no battery — reader-powered)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e ABS plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm Factor:\u003c\/strong\u003e Keyfob\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUID:\u003c\/strong\u003e Rewritable \/ Changeable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Uses\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCloning existing RFID access cards or fobs\u003c\/li\u003e\n  \u003cli\u003eBuilding \u0026amp; office entry systems\u003c\/li\u003e\n  \u003cli\u003eSmart door lock compatibility\u003c\/li\u003e\n  \u003cli\u003eSecurity testing and RFID development\u003c\/li\u003e\n  \u003cli\u003eKeyring access credential replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general information on RFID technology and wireless communication standards, visit the NIST Radio Technology Division.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What RFID frequencies does this rewritable keyfob support?\u003c\/h4\u003e\n\u003cp\u003eA: This keyfob supports two frequencies: \u003cstrong\u003e13.56 MHz\u003c\/strong\u003e (UID-changeable IC format, compatible with many modern access control systems) and \u003cstrong\u003e125 kHz\u003c\/strong\u003e (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.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I clone my existing access card or fob onto this keyfob?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this RFID keyfob require a battery?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the memory capacity of this keyfob chip?\u003c\/h4\u003e\n\u003cp\u003eA: The chip has a \u003cstrong\u003e1KB (1 kilobyte)\u003c\/strong\u003e memory capacity, which is sufficient for storing standard RFID access credentials and sector data used in most common access control applications.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What RFID frequencies does this rewritable keyfob support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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). 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