Description
Description
The X0027J4P9F MIFARE key fob is a compact RFID access‑control token typically sold under generic or OEM brands, most often on Amazon. It uses 13.56 MHz MIFARE Classic (1K) technology, giving it fast read times, short‑range secure authentication, and compatibility with a wide range of door controllers, time‑tracking systems, and NFC‑based access readers. The fob is shaped like a small oval or teardrop‑style plastic tag, usually with a metal key‑ring loop, making it easy to attach to keys or lanyards. Inside the sealed housing is a MIFARE Classic 1K chip and antenna coil, providing 1 KB of memory for UID and sector data. These fobs are durable, water‑resistant, and designed for everyday use in commercial buildings, apartments, and office access systems.
Features
- 13.56 MHz MIFARE Classic (1K) chip — industry‑standard RFID technology
- 1 KB EEPROM memory — divided into sectors/blocks for UID + data storage
- Short‑range contactless operation — typical read distance 1–3 cm
- Fast authentication — compatible with most MIFARE Classic readers
- Durable ABS plastic housing — impact‑resistant and water‑resistant
- Teardrop/oval key‑tag form factor — compact and easy to carry
- Integrated metal key‑ring loop — attaches to keys, lanyards, or badges
- Passive RFID (no battery) — unlimited read cycles, long service life
- Common for access control — apartments, offices, time‑tracking, NFC systems
