Fully compatible with IC 1K cards. Block 0 of the card, where the UID is located, can be modified multiple times. Modification of Block 0 can be done directly using a standard IC reader and writer, no additional equipment required. Default password is FFFFFFFFFFFF. Storage capacity: 8 Kbit, 16 sectors, with two sets of passwords per sector. Working frequency: 13.56 MHz Communication speed: 106 Kbps Reading distance: 2.5–10 cm Read and write time: 1–2 ms Operating temperature: -20°C to 85°C Erase and write cycles: more than 100,000 Data retention: more than 10 years Complies with ISO/IEC 14443 and ISO/IEC 10536 standards Application: Prepaid water meters, campus cards, bus stored-value cards, highway tolls, parking lots, community access control Color: Assorted colors Material: ABS Package Contents: 50 x UID copy cards Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations between the color shown in the image and the actual item. Measurement tolerance: ±1–3 cm.