1,Unique design, solid structure, 2,Portable, multi-languages available 3,Working time: 135Hours 4,Standy time: 90day Folding Protective Aluminium Bluetooth Keyboard for ... to 4bm as maximum, good for your health with lowest radiationOperation distance: 10mOperating temperature:-10-55°CWorkable environment:0-55° ... )*11.6(H) mmWeight: 295±30g Aluminum Case + Wireless Bluetooth Keyboard for iPad 2 / 3