OBO HANDS UID 13.56MHz IC Tags Clone Changeable Smart Keyfobs Key Tags Card 1K S50 MF1 RFID Access Control Block 0 Sector Writable (20)

Description:
0 Sector 0 block can be modified
UID Changeable MF 1K S50 Smart IC Card
RFID 13.56MHz ISO14443A Induction
This card works the same as normal MF cards.
Works exactly like the MF S50, with 16 Sectors and 4 Blocks each Sector,
But the Sector 0 Block 0 known as Manufacturers Block where the Chip UID is stored, can be re programmed to any UID you wish.
Popular applications: Loyalty / Ticketing / Identification / Access Control

Advantage:
This is a perfect solution for a lost irreplaceable MF Cards ID, you don't need to re-enroll new cards. Just program this new MF 1K's
UID to the UID of lost card then you have a new Exactly the same card.

Specifications:
Frequency: 13.56 MHz
Capacity: 1K bytes EEPROM memory
Rewrite Times: 100,000 times
Read Distance: 0-10cm (Depends on the R/W device)
Material: PVC
Card Dimensions: 85x54x0.9 mm

Package:
20xkeyfobsds

Note
This UID tag requires a card reader to write. The meaning of writing is just writing the inner code, not writing other data.
The Android Mifare Classic Tool and NFC Tools just writes data, such as date, name, etc.