TagsForDroid 10 NFC Tags + 1 NFC Key Chain + Stickers (MIFARE 1K) Operating Frequency: 13.56 MHz - Data Retention: 10 years Memory Size: 1024bytes (1KB) NFC Chip Type: MIFARE(TM) classic compatible 10 NFC Tags + 1 FREE NFC keychain + 1 sheet of 12 vinyl stickers (to paste on your NFC tags) WARNING, WILL NOT WORK with Samsung Galaxy S4, NEXUS 4 or 10... Purchase our NTAG203 NFC tags instead, if you own these devices.