The card is fully compatible with IC 1K cards. Block 0 of the card, where the UID is located, can be modified multiple times. Modifications to Block 0 can be performed directly using a standard IC reader and writer, without requiring additional equipment. The default password of the card is FFFFFFFFFFFF. Parameter: 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 Reading and writing 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 Production standard: ISO/IEC 14443, ISO/IEC 10536 Application scope: Prepaid water meters, campus cards, bus stored-value cards, highway tolls, parking lots, community management Color: Mixed Material: ABS Package Contents: 50 x UID copy cards Only the above package content is included; other products are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement allows an error of +/- 1–3 cm.