Aryamobi Mirror Flip Premium cover are perfect fit for your luxury phone Samsung Galaxy J4. You have to install the app as provided in the instruction slip along with the cover to make it work properly. You can create multiple themes on cover and can also see date / time etc from top. Mirror Flip Cover Case Imported environmental materials. Both sides use the latest dustless matte UV painting technology, with comfortable sense of touch and elegant appearance. The rigidity is good enough not to transfer and break off easily.Open mold according to real mobile phone with precise function holes. You can handle as freely as you wished. The surface uses salient point design, wear-resistant, anti-skidding, dust-proof, anti-fingerprint and easy to clean.