Carriers and safety

The tag only stores a link. No name, no phone number: you decide in your dashboard what a finder sees.

• NTAG213 is the best fit: 144 bytes, an ID Slid link takes about 50. Works with iPhone and Android.
• NTAG215 / NTAG216 work too (more memory, more expensive).
• Avoid MIFARE Classic and 125 kHz “door fobs”: some phones can't read them.

• Sticker (Ø25–30 mm) — phone, laptop, suitcase, helmet.
• Keychain (epoxy or silicone) — keys, backpack, pet collar.
• Card (85×54 mm) — in a wallet next to documents.
• Bracelet — for adults who may need help (for example, older people).
• QR only — cheapest: print on plain paper or a sticker, readable by any phone.

• Search marketplaces for “NTAG213 stickers” or “NTAG213 keychain”.
• Check the listing says NTAG213/215/216 and 13.56 MHz.
• Any printer works for QR; outdoors, laminate it or use vinyl stickers.

• Don't give small carriers (stickers, keychains) to children under 3: they can be swallowed.
• Don't hang a tag around the neck on a cord: strangulation risk.
• Attach the tag inside clothing, a backpack or a stroller (sew-in label, pocket).
• Outside — only a QR without the child's name. The name is shown only if you allow it in the dashboard.

• Epoxy keychains and laminated cards survive rain; paper stickers don't.
• A regular sticker won't read on metal: use an “on-metal” (anti-metal) tag.
• Metal cases and RFID-blocking wallets block NFC: a QR label helps here.

• iPhone (XS and newer) reads tags without an app: hold near the top of the back.
• Android: NFC must be on; hold to the middle of the back.
• If NFC doesn't work, the phone camera reads the QR, or the code can be typed on the /c page.