Frequently Asked Questions

You have full control over who sees what. Every piece of information in your profile — with the exception of your first name and username — can be set to one of three visibility levels:

You set visibility individually for each field, so you can mix and match.

Each Knock ID card is linked to one profile. To cover multiple family members, you'll need a separate card and profile for each person.

Yes. A Knock ID card purchase is required to create a medical profile. You can get yours at knockid.com/product/nfc-medical-id/.

The Knock ID card uses NFC (Near Field Communication) — the same technology behind Apple Pay and Google Pay. When tapped against an NFC-enabled smartphone, it instantly opens your medical profile in the phone's browser. No app download, no login required.

Where to hold the card:

• iPhone: Near the top of the phone, close to the camera.
• Android: Near the center of the device.

Not sure where your NFC reader is? Contact us and we'll help.

No. NFC chips are passive — they draw power from the reading device, not from a battery. There's nothing to charge, nothing to replace. The chip has a lifespan of over 10 years.

The Knock ID card is made of PVC plastic and is fully waterproof. It's designed to hold up to everyday wear — wallets, pockets, keychains — and is backed by a lifetime warranty.

Yes. The Knock ID card is covered by a lifetime warranty. If your card stops working due to normal wear and tear, we'll replace it at no charge. The only potential cost is shipping.

Please allow 24–48 hours of processing time before your order ships. Orders are fulfilled on business days only. Once shipped, US orders typically arrive within 2–5 business days. For full details, see our Shipping & Delivery Policy.

Yes. We accept returns within 30 days of purchase for items in new and unused condition. For full details, see our Return Policy.