I bought these and they do not work. What am I looking for?
Amazon.com: NFC Tags - 10 LifeProof PVC Tags (5 Anti-Metal) + 2 NFC Keychains (Tags & Keychains are MIFARE 1K) + 1 Sheet of Vinyl Waterproof Stickers - Tags and Keychains are NDEF Formatted NFC Chips - Android NXP & Windows 8 (WP8) Compatible - AT&T
Amazon.com: NFC Tags - 10 LifeProof PVC Tags (5 Anti-Metal) + 2 NFC Keychains (Tags & Keychains are MIFARE 1K) + 1 Sheet of Vinyl Waterproof Stickers - Tags and Keychains are NDEF Formatted NFC Chips - Android NXP & Windows 8 (WP8) Compatible - AT&T