10pcs UID Keychain 13.56MHZ Access Control Card Rewritable IC Blank Copy Elevator Card(Random Color Delivery)

1. This card is a KIC keychain, a rewritable card that can be repeatedly erased and rewritten. It can be a fully open blank card with rewritten sector 0 and all sectors, and can modify the UID on Mifare cards, 1K cards, and S50 cards. 2. Block 0 of the card (the block containing the UID) can be modified arbitrarily and repeatedly. 3. Block 0 can be modified directly using ordinary Mifare read/write methods; no special equipment is required. 4. The default password for the card is 12 Fs, i.e., FFFFFFFFFFFF. 5. Compact and exquisite appearance, colorfast, waterproof, drop-proof, sturdy and durable. 6. Can be attached to a keychain for easy carrying. 7. Resistant to high and low temperatures, long service life.