20pieces- UID Changeable RFID Writable Programable Keychain,13.56MHz RFID Uid Changeable Block 0 Writable Tag Fobs, IC Card Access Control Smart Keyfobs Key Tags - Black

• 【Perfect Size】The package includes 20PCS UID card. The size of card is 40*32*3.6mm. Frequency: 13.56 MHz, Rewrite Times: 100,000 times.
• 【UID Card】0 Sector 0 block can be modified. This card works the same as normal IC cards. Works exactly like the S50, with 16 Sectors and 4 Blocks each Sector, but the Sector 0 Block Zero known as Manufacturers Block where the chip UID is stored, can be reprogrammed to any UID you wish.
• 【High Quality】The UID key fob is made of high-quality ABS material, the shell is strong and durable, has good waterproof, shockproof and anti-corrosion performance.
• 【Widely Application】This UID cards can be applied to Access control, hotel locks, school campus access, identification and security systems. This is a perfect solution for a lost irreplaceable IC Cards ID, you don't need to re-enroll new cards. Just program this new UID to the UID of lost card then you have a new Exactly the same card.
• 【Quality Assurance】If there is any quality problem, we can provide free return service, brings you worry-free shopping experience.

UID Changeable RFID Writable Programable Keychain, IC Card Access Control Smart Keyfobs UID Card Details: Color：Black Shape：Round head Size: 40*32*3.6mm Material: ABS Operating Frequency: 13.56 MHz Rewrite Times: 100,000 times Reading Distance: 0-10 cm Features: High quality access to door control for RFID cards. Widely used in homes, offices, parks and other places. 0 Sector 0 block can be modified. Works exactly like the S50, with 16 Sectors and 4 Blocks each Sector, but the Sector 0 Block Zero known as Manufacturers Block where the chip UID is stored, can be re programmed to any UID you wish.