NFC Stickers - Mifare Classic 1k 13.56Mhz NFC Tags NDEF Formatted For Galaxy S3, Windows Phone 8, and Android (Pack of 5) With the Anti-Metal Layer, these NFC Stickers work on almost any surface (unlike other NFC Stickers that don't have the Anti-Metal Layer) Pack of 5 Mifare Classic 1K NDEF Pre-Formatted, Anti-Metal NFC Tag White Stickers that are 30mm in Diameter (1.18in) NFC Chip Type: MIFARE(TM) classic compatible w/ NDEF Formatting already done. Better than Samsung Tectiles, as they work on Metal Surfaces. Compatible with Tectile. Operating Frequency: 13.56 MHz - Data Retention: Approximately 10 years. NFC allows for NO BATTERIES REQUIRED Works with Samsung Galaxy S2, S3, LG Optimus G, HTC One Series and other NFC-Enabled Android Phones. Must be compatible with Mifare Classic Chip. Nexus 4/10 can't write to Tag, but can read UID for some features.