5/10PCS RFID Rewritable Magic Wristband 13.56Mhz CUID Gen2 Smart Chip Bracelet 1K S50 Clone Tag NFC Changeable Copy Token

The chip of this bracelet is a CUID chip. Please make sure your device supports CUID reading and writing before use. If you don't have a device, I recommend buying an x7 device or a proxmark3 device:
https://es.aliexpress.com/item/3256805928674332.html?gatewayAdapt=glo2esp4itemAdapt
https://es.aliexpress.com/item/3256805412313413.html?gatewayAdapt=glo2esp4itemAdapt
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Specification:
1. CUID card block 0 (UID block) can be modified arbitrarily.
2. Block 0 can be modified directly with an ordinary IC reader/writer.
3. The default password of the card is 12F, FFFFFFFFFFFF.
4. Supports NFC modification of UID on Android phones, but does not support iPhone (but NFC on mobile phones is relatively unstable, we usually recommend using an RFID reader for reading and writing!)
5. Please confirm that your device supports writing to CUID card.

Frequency: 13.56 MHzProtocol: ISO14443ACapacity: 1k bytes EEPROM memoryNumber of rewrites: 100,000 timesModulation method: ASK Manchester encodingReading distance: 0 ~ 7 cm (depends on the card reader)Material: siliconeSize: Please see the size chart on the details page for details

Application:
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Swimming pool, gym, cold storage, access control, event ticketing, suitable for humid environments
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Warn:
1. The wrist straps are all adjustable and can be adjusted according to the size of the wrist.
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2. Bracelet IC-CUID chip, make sure your device supports reading and writing of CUID chip before you can use it.
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3. The appearance of the product may be slightly different, but its functions are the same.
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The style, chip, appearance, and pattern printing of the bracelet can all be customized. Customization is supported for a minimum of 200 pieces. Please contact customer service for details on customization fees.