Features: Experience precise and fast typing with the Keyboard Case, a lightweight alternative for Pro11 Air 4/5 10.9inch users. The Keyboard Case craft from plastic, ensuring durability and easy cleanings. Suitable for professional, students , this keyboard case offer adjust angle feature and secure magnetic attachment. Improve your productivity wherever you is at office, in coffee shop,on traveling with the convenient and comfortable Keyboard Case. Unlocks your potential with the Keyboard Case, a accessory for users seekings efficient typing experience. Specifications: Material:Plastic for Pro11 Air 4/5 10.9inch; Size:Approx.25x18.5x1.50cm/9.84x7.28x0.59inch Power:Lithium Button Cell Battery(Replaceable and Rechargeable） Operate Distance:10meters/32.8ft Modulation method: GFSK Working voltage: 3.0-4.20V Working current:<2.5mA Stands by current:<0.30mA Sleep current:<40uA Charging current:>200mA Stands by time:>100days Charging time: 3-4hours Lithium battery capacity:250mAh Sustainable working hours:>30 hours Package Includes: 1pc Keyboard Case note: Please allow 1-2cm errors due to manual measurement,please make sure that you donot mind befores you order. Due to the differences between different monitors, the picture may not reflect the actual item color.