myBitti Samsung Galaxy note10.1 Inch (N8000/N8010/N8013) Portfolio Case with Removable Bluetooth Keyboard and Stylus Pen (red) Super Slim & Light-weighted with Soft Touch & extremly Quiet Elegent and Durable Cover with state of art technology Built-in Rechargable LI-Ion Battery has 130 days standby time. Continual Working Time: 120 Hrs.