ID Key Fob Card Proximity ID Card Token Tag Keyfob,125kHz, Read Only

Description

125kHz RFID Proximity ID Key Fob (Read-Only)
This compact, teardrop-shaped 125kHz RFID key fob token is a contactless proximity tag engineered for fast, secure access verification. Built into a pocket-sized, impact-resistant keyring enclosure, it features an internal copper antenna and chip pre-programmed with a unique, unchangeable identification number. It transmits data passively upon entering the field of a compatible reader, making it a rugged alternative to traditional rectangular proximity cards.

* Operating Frequency: 125 kHz (Low Frequency / LF)
* Chip Architecture: Pre-programmed read-only structure (commonly EM4100, TK4100, or compatible models)
* Memory Capacity: 64-bit unique ID number hard-coded during manufacturing
* Sensing Distance: 2 cm to 10 cm (depending on reader power and antenna efficiency)
* Material Composition: Waterproof, dustproof, and crush-resistant ABS plastic shell fitted with a durable metal split ring
* Power Requirement: Passive operation (battery-free design powered entirely via induction by the RFID reader’s magnetic field)
* Applications: Widely used in apartment building entryways, corporate office access control, parking barrier gates, gym membership check-ins, and employee time-attendance tracking loops