Dual Connectivity Rugged Keyboard uses Both USB and Bluetooth, pairs with Samsung DeX Station - The BT-870-TP Rugged Keyboard | Officer
Cooper Cases(TM) FK50 Samsung Galaxy Tab S 8.4 (AMOLED) / LTE Tablet Folding Bluetooth Keyboard Dock in White (US English QWERTY Keyboard, Mini Travel Stand, Collapsible Design) : Amazon.in: Computers & Accessories