100PCS Waterproof Proximity Key fob ABS-003 125KHz TK4100 Keychain Tag Contactless RFID Keyfob Chip:TK4100 Read Only Bidirectional Data Transfer Protocol

Bidirectional Data Transfer Protocol

printable on most desktop photo ID card printers

Function: Read/Write protect by password

so you can put the RFID Blocking card in left side and right side in your wallet

Impinj M4(M5) etc

100PCS Waterproof Proximity Key fob ABS-003 125KHz TK4100 Keychain Tag Contactless RFID Keyfob Chip:TK4100 Read Only Bidirectional Data Transfer ProtocolWaterproof Proximity ABS 003 125KHz TK4100 Keychain Tag Contactless RFID Keyfob Advantages: 1. Resistant to dust, dirt and humidity2. Possibility to combine two technologies in one key fob3. Suitable for indoor and outdoor use4. An attractive palette of colors is available as is a competent encoding service. 5. Personalization: The rfid key fob can be personalized by full colour printing or long lasting laser engraving, using your logo, a number or