# Cartao de Proximidade: The Ultimate Guide to Proximity Cards ## What is a Cartao de Proximidade? A **Cartao de Proximidade**, or proximity card, is a contactless smart card used for access control, identification, and secure authentication. From my personal experience working in corporate security, transitioning from traditional key systems to a **Cartao de Proximidade** system dramatically improved our building's security while simplifying access for hundreds of employees. I discovered I had a particular knack for troubleshooting card reader issues, often identifying frequency conflicts that others missed. ### Technical Specifications of Modern Proximity Cards When evaluating a **Cartao de Proximidade**, understanding the technical parameters is crucial. Here are detailed specifications for a typical high-frequency proximity card: **Physical Dimensions:** - Standard ID-1 format: 85.6mm × 54.0mm × 0.76mm - Thickness variations: 0.68mm to 1.02mm - Weight: Approximately 5-6 grams **Chip and Frequency Details:** - Operating Frequency: 13.56 MHz (HF) - Chip Manufacturer Codes: NXP Mifare Classic 1K (MF1S503x), Mifare Plus (MF2SDAy), or Mifare DESFire EV2 (MF3D(H)x2) - Memory Capacity: 1KB, 2KB, 4KB, or 8KB EEPROM - Data Retention: Minimum 10 years - Write Endurance: 100,000 cycles minimum - Communication Interface: ISO/IEC 14443 Type A - Read Range: 0-10 cm (depending on reader power) - Anti-collision: Capable of reading multiple cards simultaneously *Important Note: These technical parameters are reference data. For exact specifications tailored to your specific **Cartao de Proximidade** needs, please contact our backend administration team.* ## Entertainment Applications of Proximity Cards Beyond security, **Cartao de Proximidade** technology has fascinating entertainment applications. I recently attended an immersive theater experience where our proximity cards served dual purposes: they granted us access to different performance areas while storing our interactive choices throughout the show. The cards determined which storyline paths we experienced, creating personalized narratives for each audience member. Theme parks have similarly adopted t