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⚠️ IMPORTANT COMPATIBILITY NOTE: These RFID cards are designed only for 125kHz access control systems using EM4100 or TK4100 technology. They are not compatible with 13.56MHz readers, NFC, MIFARE, mobile phones, or systems that require writable/reprogrammable cards. Please check your reader frequency be EM4100 / TK4100 CHIP TYPE: Each card uses a 125kHz read-only proximity chip, making it suitable for many standard low-frequency door entry, ID access, time attendance, and security control systems. QUICK CONTACTLESS ACCESS: No swiping or inserting is required. Simply present the card near a compatible RFID reader for fast, convenient identification and entry. READ-ONLY UNIQUE ID CARD: These cards come with a fixed pre-programmed ID number. The number cannot be changed, copied over, rewritten, or reprogrammed, making them ideal for systems that enrol card IDs directly through the access controller. DURABLE PVC CARD DESIGN: Made from strong PVC material with a standard credit-card style shape, these cards are lightweight, easy to carry, and suitable for everyday use in offices, apartments, gyms, warehouses, and entry systems.