Supports reading, writing, and reprogramming, with over 100,000 rewrites. Can clone 13.56MHz IC cards, NFC stickers, NOT compatible with 125KHz key cards. Fully compatible with MI- Classic 1K,4- UID, 1024 bytes of memory, organized into 16 sectors with 4 blocks, compatible with /IEC 14443A protocol. Compatible with all types of 13.56MHz RFID readers and door access control system devices. Water-resistant. Each comes with a keychain included. Each card has a unique encrypted ID number; card data can be reprogrammed. Color: blue Material: ABS Package Contents: 100 x cards Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real one. The allowed measurement error is +/- 1-3 cm.