1,Unique design, solid structure, 2,Portable, multi-languages available 3,Working time: 135Hours 4,Standy ... time: 90day Folding Protective Aluminium Bluetooth Keyboard for iPad 2 / 3 H5088Packaging & Delivery : Packaging Detail:Dimension :245 (L)*197(W ... environment:0-55°CHumidity:10%-70%Working current:<5.0MA,Operation Voltage:3.0-5.0V Standby time:150 hoursOptional color: sliver ...