3.7-inch tri-color ink screen, no need for charging, uses NFC for data transfer Massive selection of preset effects in the app to choose from, also supports uploading images from the gallery PC backplate, TPU frame, metal camera ring, 360 four-corner all-inclusive groove design effectively mitigates the impact of falls Metal frame protection, effectively protects the camera Skin-friendly matte layer, sweat-resistant and anti-fingerprint, offers a more delicate touch experience How to use: 1. Open NFC function. 2. Download the APP "INKZONE". 3. Install the phone case on the phone. 4. Log in and register for APP use. 5. Open the INKZONE APP home page and click My Devices Connect the phone case. 6. Click Start Your Creation", and create your own theme. 7. After creating the picture, click the "Use button to upload it synchronously phone case. Specification: Screen size: 3.7 inches Screen resolution: 240(H)*416(v)px Screen color system: tri-colors Compatible with: iPhone 13 iPhone 14 Package included: 1 x Phone Case Other items not included