... 1,Unique design, solid structure, 2,Portable, multi-languages available 3,Working time: 135Hours 4,Standy time: 90day Folding Protective Aluminium Bluetooth Keyboard ... radiationOperation distance: 10mOperating temperature:-10-55°CWorkable environment:0-55°CHumidity:10%-70%Working current:<5 ... hoursOptional color: sliver black / silver whiteBritish keyboard:10 inch,82 keys,245*95mmBattery: standby time- ...