NFC Tags - 20 PVC Tags (10 Anti-Metal) + 2 NFC Keychains + 2 Sheets of Vinyl Waterproof Stickers (Mifare 1K NDEF Formatted) - Android Windows 8 Compatible - AT&T Sprint Verizon Wireless - Nokia Samsung Galaxy S3 S2 Accessories - Lifetime Guarantee 20 Mifare Classic 1K NDEF Pre-Formatted NFC Tags (Rigid White PVC - 30mm in Diameter (~quarter sized) with Adhesive Backing) 5 of which are Anti-Metal + 2 NFC Keychain FOBs (32mm x 52mm) + 2 Sheets ea w/ 12 Vinyl Stickers to Differentiate your Tags NFC Chip Type: MIFARE(TM) 1K classic compatible w/ NDEF Formatting already done. Compatible with Tectile. Mifare 1K Memory Size: 1024bytes (1KB), holds vCard, long text. High Quality, Long Lasting (Approx 100,000 Data Read/Write Cycles) Compatible with many Android Phones and/or NFC Readers, including the Samsung Galaxy S3 (Not Compatible with S4, Nexus 4 or the Nexus 10), Samsung Note, LG Optimus G, HTC One Series and 95% of all NFC enabled Phones Operating Frequency: 13.56 MHz - Data Retention: Approximately 10 years. NFC allows for NO BATTERIES REQUIRED