Kindly Morrow
NFC E-Ink Display Keychain
Tap your phone to this keychain and the image on its e-ink screen changes. No battery, no charging, no app subscription. The NFC module pulls power from your phone's NFC radio to refresh the e-ink display, so the image stays visible indefinitely with zero power draw. Load photos, pixel art, QR codes, or custom graphics from any NFC-enabled phone.
Project idea: Load your home WiFi QR code onto the display and clip it near your front door. Guests tap their phone to read it, or just point their camera at the always-visible QR code. Update the image when you change your WiFi password.
Key Features
- E-ink display with NFC power: screen updates wirelessly when you tap your phone, then holds the image with no battery
- No charging ever: the NFC field provides enough energy to refresh the display. Once written, it stays
- Works with iPhone (7+) and NFC-enabled Android: no proprietary app lock-in, standard NFC write apps work
- Swap images anytime: load a new photo, QR code, or pixel art design in seconds via phone tap
- Keychain form factor: clip it to your bag, keys, or lanyard
- High contrast e-ink: readable in direct sunlight, unlike LCD or OLED screens
- Conversation starter that actually does something: show your WiFi QR code, contact info, or rotating artwork
Frequently Asked Questions
How does the e-ink display update without a battery?
NFC is a near-field communication protocol that transfers both data and power. When you hold your phone close, the phone's NFC radio generates an electromagnetic field. The keychain harvests enough energy from that field to refresh the e-ink display. Once the image is written, e-ink holds it with zero power, like a printed page.
What image formats and sizes does this display support?
Most NFC e-ink keychains accept black-and-white bitmap images at the display's native resolution (commonly around 250x122 or similar). The companion app or NFC writing tool handles conversion from standard image formats (JPG, PNG). For best results, use high-contrast images and avoid fine gradients.
Will this work through a phone case?
Standard silicone, plastic, and thin leather cases work fine. NFC reads through non-metallic materials up to a few millimeters thick. Metal cases or cases with built-in magnets (MagSafe rings) can interfere. If you have trouble, try holding the keychain directly against the back of your phone near the NFC antenna location.
Frequently Asked Questions
What is included with the NFC E-Ink Display Keychain?
The NFC E-Ink Display Keychain includes the main product as listed, any accessories shown in the product images, and a quickstart guide. Check the product description above for the full list of included components.
Is the NFC E-Ink Display Keychain compatible with Home Assistant?
Compatibility depends on the product type. Every product page at Kindly Morrow includes a compatibility section. Look for supported ecosystems (Home Assistant, Zigbee, Z-Wave, WiFi) in the product description and tags above.
What skill level is the NFC E-Ink Display Keychain designed for?
The NFC E-Ink Display Keychain by Kindly Morrow is designed to be accessible for beginners. If soldering or advanced setup is required, that is clearly noted in the product description. Our starter kits include step-by-step guides.
