Introduction:
CUID card: upgrade the copy card, and the system that shields the UID copy card can use CUID instead of UID, 70%
Passing rate. All sectors can be rewritten repeatedly.
NFC, iod APP (MCT), acr122U, iCopy3, and Proxmark 3 support writing to CUID cards.
But not all NFC phones support writing CUID cards,
CUID block 0 cannot be written randomly, which may cause card damage,
CUID card block 0 (UID block) can be modified at will. There is no back door and it can be written through NFC mobile phone App MCT.
The default password of the card is 12 F, FFFFFFFFFF.
Crystal card is a new RFID smart card with a highly personalized appearance, which is crystal clear and transparent. It has strong three-dimensional sense and features of dust-proof, waterproof and anti vibration

Specification:
New and high quality
Chip: CUID read-write 0 blocks and sectors
Color: as shown in the figure
Printing: offset printing, silk screen printing, electronic printing
Process mode: drip encapsulation
Coding mode: laser code
Storage capacity: 8Kbit, 16 partitions, two sets of passwords for each partition
Operating frequency: 13.56 MHz
Communication rate: 106KBoud
Reading and writing distance: 2.5~10cm
Reading and writing time: 1~2ms
Operating temperature: - 20 ℃～ 85 ℃
Erase life:>100000 times
Data preservation:>10 years
Application scope: patrol system, attendance system, access control system, all-in-one card system and other RFID identification fields
Size:01/35mm,02/40mm,03/40mm,04/40mm
characteristic:
1. Crystal drops, fashionable appearance
2. Waterproof and moisture-proof, wear-resistant and fall resistant
3. Comfortable and easy to use
Package Included：1pc

Note:
1. Due to manual measurement, please allow an error of 1-3mm.
2. As different computers display different colors, thank you for your understanding, the actual product color may be slightly different from the image.