Imagine your phone case as a canvas, dynamically changing to display your style or mood. How cool is that? The E Ink Case turns this cool fantasy into reality, redefining smartphone customization.? DIY Customization Customize your case with anything you want to showcase - be it your favorite celebrity, your daily to-do list, your motto, your company's logo, or even a picture of your beloved pet. The possibilities are endless, and every design you choose makes your phone case a unique conversation starter. NFC Connection & Ultra-Fast Display The e-ink Cover utilizes NFC for power-saving connectivity, with no battery or charging, freeing you from any concerns about power consumption. It offers a rapid 13-second display update and features a high-clarity E-Ink screen optimized to reduce ghosting, ensuring vivid visuals with every use. Certified Protection & Precision Fit? Durable Materials: The e-ink case is crafted from a robust combination of PC, Silicone, and Glass materials, with an added layer of premium acrylic for screen protection that has passed drop tests. Precision Fit: Designed with a 1:1 mold, it ensures seamless access to all buttons and ports. Four-Color Ink Screen: The image will turn into four-color ink screen after conversion: black, white, red, and yellow. Exclusive Design and Certifications: This e-ink phone cover is a unique model with EU appearance patents and full certifications, including FCC, CE, and RoHS. How to Use Put your phone into the e-ink cover for auto NFC connection. Download: Scan the QR code on the packaging or find the "Ink Show" app from the official store. Start Creating: No sign-up is needed. Click the [GO] button to start DIY creation such as adding a new picture/text, editing it freely, and creating your work name. Finish with [Cast Screen] to update your case.? Specifications: Screen Size: 3.7 inches Screen Resolution: 240(H) x 416(V) px Color: 4-color display (black, white, red, and yellow)