The E-Ink case first time you see look a bit odd, it is like having a small secondary screen built in to the back of your phone case that allows for static image, notifications or even wallpaper change without using significant battery. Here's what's actually going on.
The technology behind it
E-Ink (electronic ink) is the same ultra-low-power display tech that is used on devices such as e-readers, including Kindle. Rather than backlighting pixels as an LCD or OLED screen does, E-Ink organizes physically charged particles to create an image, and crucially, it only consumes power when the image is changing rather than while it's on display. This is why a case with an E-Ink can displays a still image permanently without making any significant impact on your smartphone battery.
What can you use one for, actually

- Set a static image or pattern of your choice which can be seen even when phone is locked.
- Other models connect with an app to alter the design, based upon the time of day, notifications or your calendar
- Only works as a watch the function will not get extended with smart features like notifications with interactive buttons unless supported by specific model (Check before you buy)
Who is this really beneficial for
- Those that love to change how their phone looks — without having to buy new cases
- Anyone who needs a subtle way to customize their phone without a bulky add-on
- Individuals who enjoy the look of EInk's paper-like, no-glare screen
What to know before buying

E-Ink cases are more of a fashion and custom accessory than one that actually upgrades functionality, unless otherwise stated, you should not expect app notifications or interactivity. Make sure, too, that your case still gives you total access to the camera buttons and charging port (the touch-sensitive display needs room in the case, which could take up some real-estate elsewhere).
Check out our E-Ink case collection if you want a cover that can double as an understated fashion accessory.