Super Sniffer Card 1k & 4k
Card to do discrete sniffing over the high-frequency MIFARE reader.
If carrying your Proxmark3 seems suspicious to you, then this card would be the ultimate tool to have.
Protocol: ISO14443-A/B 13.56MHz
Package: White card
UID Byte length: 4 or 7 Byte
Card capacity: 1K & 4k
Once you place the super sniffer card to the RFID reader, the card would copy the sector keys to the card with the UID identified.
Instructions for use
Set desired UID to Super Sniffer Card via Android App or Proxmark3.
Go to the RFID reader and tap the card.
The reader will respond to card and walk away.