Main Features● You can scan this notebook by App ( download App from the user manual ), and create backup copies● Supported system: iOS 8.0 and above, Android 4.1 and above● The gel pen is not recommended ( it is hard to be erased )● The paper became thicker, and the cover was gilded. It was a notebook that can be wiped with wet wipes● It can be repeated writing of 500 times without obvious marks● Design pen insert and plastic loose-leaf coil for easy to disassembleMaterial: OthersFeatures: RewritableColor: Black,GrayPackage weight: 0.319 kgProduct size (L x W x H): 17.60 x 25.00 x 1.00 cm / 6.93 x 9.84 x 0.39 inchesPackage size (L x W x H): 20.00 x 28.00 x 3.00 cm / 7.87 x 11.02 x 1.18 inchesPackage Contents: 1 x ELFIN Book, 1 x Pen, 1 x Chinese User Manual