These key fobs only have basic data in them. You can use a reader/writer device to read your card and use the card as a duplicate card. It should be noted that the card must be written with a 125KHz RFID card writer to write data (card number) into it
Working frequency: 125KHz; Sensing distance: 1-4 inches (2.5-10 cm) Data storage life: 10 years
Repeatable read/write: These key fobs can be erased and written with data many times, about 100,000 times
The shell is made of ABS material, which is sturdy and durable, with a built-in thick coil, and the induction is more sensitive
The package contains 5 key fobs of mixed colors
Description
HETYY 5pcs Mixed Color 125KHz Re-writable Key fobs Proximity ID Card Token Tag Rewritable T5577 Universal