Energy-Saving keyboard sleep mode. Comfortable to type. Quiet keystrokes. Waterproof and dustproof design. Stylish, and high grade protective real leather case stand. Lightweight, compact, easy to carry and handle. Easy operation, need no drive, just plug and play. Ideal for students, business persons, travelers, etc. Specifications: Bluetooth standard: Bluetooth 3.0 Operation distance: 10m Modulation system: GFSK 2.4G Operation voltage: 3.0-5.0V Working current: 100mA Standby time: 60 days Charging time: 4-5 hours Lithium battery capacity: 450mA Uninterrupted working time: 40 hours Lithium battery life: 3 years Lithium battery size: 47*25*4.5mm Key strength: 80±10g Key life: 5 million strokes Operating temperature: -10 to +55 Celsius degrees Color: Black Material: Keyboard: Silicon Case: PU leather Keyboard size: 23.4*12.5*0.7cm Case size: 24.8*17*2.8cm Product weight: 440g Package size: 28.5*19*3cm Package weight: 495g Package Includes: 1 * Bluetooth Keyboard + Leather Case for Samsung 8.9 1 * USB Cable 1 * User Manual