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DescriptionSecurity and access control are fundamental aspects of modern hardware design. The 125KHz RFID Proximity Card provides a seamless, contactless way to authenticate users, unlock doors, or track attendance without the mechanical wear and tear of traditional keys or magnetic swipe cards.Read-Only SecurityOperating on the universally recognized 125 KHz low-frequency (LF) band, this card utilizes the standard EM4100 (or equivalent TK4100) chipset. It is exclusively a “Read-Only” device. During the manufacturing process, a unique 64-bit identifier is permanently burned into the microchip’s memory. This ID cannot be altered, spoofed easily, or overwritten, ensuring a high level of consistency for access control systems. You simply scan the card with an RFID module (like an RDM6300), read the ID, and program your microcontroller to grant or deny access based on that specific number.Passive TechnologyThis card is completely passive, meaning it contains absolutely no internal batteries. When brought within a few centimeters of an active 125KHz RFID reader, the hidden internal coil antenna harvests a tiny amount of electromagnetic energy from the reader. This instantly powers up the microchip, which then transmits its unique ID back to the reader in a fraction of a second.Standard Form FactorMade from highly durable, waterproof PVC, the card follows the standard CR80 dimensions—making it the exact size and thickness of a standard bank card or driver’s license. The smooth, blank white surface makes it perfect for custom printing using standard ID card thermal printers, allowing you to add employee photos, company logos, or barcodes.Key Features:Contactless Operation: Reads reliably within a few centimeters of the scanner, requiring no physical contact or precise alignment.Unique ID: Factory pre-programmed with a permanent, unique identification number for immediate use.Durable Design: Waterproof PVC construction withstands daily use, bending, and environmental exposure.Technical Specifications:Operating Frequency: 125 KHzChipset: EM4100 / TK4100 (Compatible)Card Type: Read-Only (Passive)Material: PVC (Blank White)Dimensions: 85.6mm x 54mm x 0.8mm (Standard CR80)Typical Reading Distance: ~2cm to 10cm (Depending entirely on the reader’s antenna size and power)Ideal Applications:DIY Arduino and ESP32 access control systemsEmployee time, attendance, and payroll trackingSecure login tokens for activating industrial machineryCustom hotel room keycard prototyping and smart home locks