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Writable RFID Epoxy Hang Keys are durable, waterproof, and customizable proximity tags used for access control, typically featuring a 125KHz or 13.56MHz chip encased in epoxy resin. These fobs are often used for apartment access, gym memberships, and as employee identification due to their high durability.
This video shows how to make a custom epoxy RFID key fob:
Key Features
- Rewritable Capability: They often utilize chips like the T5577 or EM4305 (125KHz), which allow for the key to be written to over 100,000 times.
- Waterproof & Durable: The epoxy coating is resistant to water, dust, and high temperatures, making them suitable for harsh environments or daily wear.
- Customization: Available with custom logos, laser-engraved serial numbers, or unique QR codes for branding purposes.
- Form Factor: They are small, light (around ), and often include a ring for hanging on keychains.
Technical Specifications
- Frequency Options:
- 125KHz (Low Frequency): Common for access control systems (e.g., EM4100/EM4305).
- 13.56MHz (High Frequency): Suitable for NFC applications or secure MIFARE systems.
- Memory: Typically contains small EEPROM memory for storing user-defined access data.
- Read/Write Distance: Generally operates within a range of
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