Mybitti Samsung Galaxy Note 10.1 Bluetooth Keyboard Portfolio Case - Detachable Bluetooth Keyboard Stand Case / Cover for Samsung Galaxy Note10.1 Gt-n8013 with Sytlus Pen Super Slim & Light-weighted with Soft Touch & extremly Quiet Elegent aBuilt-in Rechargable LI-Ion Battery has 130 days standby time.nd Durable Cover with state of art technology Continual Working Time: 120 Hrs. Color: Black