XTREM iPhone 18 Cases

The XTREM case features a circular, four-color E-Ink display on the back. Use the companion app to send an image to the display. E-Ink technology maintains the displayed image without requiring continuous power.

No. The E-Ink display does not have a built-in battery and does not require a charging cable. Once an image is displayed, it remains visible without continuous power.

The case does not continuously draw power from your iPhone to maintain the displayed image. Sending an image uses a small amount of your phone's power.

Open the companion app, choose the image you want, and follow the in-app instructions to send it to your case's display.

The app is currently called G Shell and is expected to be renamed XTREM INNO in late November 2026. During the transition, you may still see the name G Shell.

For iPhone 14–17 models, image transfer uses NFC. iPhone 18 models support NFC and Bluetooth as an additional image-transfer option. The available method depends on your iPhone model and app version.

When using NFC, keep your phone close to the appropriate area of the case and follow the app's instructions.

Yes. The E-Ink display maintains the image without continuous power, so the image can remain visible when your phone is turned off or the case is removed.

The current display supports four colors. Because E-Ink technology differs from conventional phone screens, the appearance of colors and image details may vary depending on the image and lighting conditions.

You can use personal photos, pictures of pets, memories, logos, and simple graphics. Image appearance depends on the original image and the characteristics of the E-Ink display.

The case is designed to be compatible with MagSafe accessories, including compatible magnetic wallets, mounts, and wireless chargers. Compatibility and performance may vary depending on the accessory and iPhone model.

The case is designed to be compatible with compatible wireless chargers and MagSafe accessories. Charging performance may vary depending on the iPhone model, charger, and accessory.

The case combines a PC shell and TPU frame, together with a circular E-Ink display.

The case is designed for everyday use and features raised edges around the camera and display to help reduce direct contact with surfaces. We do not claim a specific drop-test rating.

Where supported by the companion app and compatible devices, you can link XTREM cases and send images to each other's displays. Follow the in-app instructions to connect the cases.

First, make sure you are using the latest available version of the companion app and firmware. Follow the in-app instructions and keep your phone close to the case when using NFC. You can also restart the app and try again.

If the issue continues, contact us at hi@helloxtrem.com with your order number and a description of the problem.

Use a soft, slightly damp cloth to clean the case. Avoid harsh chemicals, abrasive cleaners, and excessive moisture around the display and openings.

Choose the correct case model for your iPhone. Gently fit the phone into the case, making sure the corners are securely in place.

To remove it, gently release one corner and ease the phone out. Avoid excessive bending or applying direct pressure to the E-Ink display.

Please email hi@helloxtrem.com with your order number and clear photos or a short video showing the issue. Our team will review the details and help you with the next steps under our Refund Policy.

G Shell is expected to be renamed XTREM INNO in late November 2026. This is a companion app name change. During the transition, some users may still see G Shell. Please follow the app instructions provided for your device and current app version.