TagsForDroid NFC Key Chain (MIFARE 1K)

Package contents: 1 NFC Key Chain NFC Chip Specifications: NFC Chip Type: MIFARE(TM) classic compatible Memory Size: 1024bytes (1KB) Rewrite Endurance: 100,000 cycles Lockable: yes (can be made read only) Data Retention: 10 years Operating Frequency: 13.56 MHz Operating Range < 2cm (depends on device) Compatibility: compatible with NFC enabled smartphones (read FAQ for more info) drop in replacement for Samsung Tectiles Keychain: Material: Rigid dark gray plastic Dimensions: 36mm x 6mm Compatibility: These tags are Mifare Classic 1k (similar to Samsung Tectiles). Due to technical limitations on the Galxy S4, Nexus 4 phone and Nexus 10 tablet, these tags will not work on those devices. They will work perfectly on the Samsung Galaxy S3 and other NFC enabled Android phones. If you are not sure, please consult your phone manufacturer.