... , fully charged stand by 3 months.3.3 Button LED backlight design, dark environment can also be ... use, need to turn on the hand-held keyboard button switch to the left, then the keyboard power-on, ... blue color words. You can switch this two inputs by pressing the small round button named “Fn” on the ... buttons’ function.5.Note :5.1 When no button operation, lights flashing, please check the low voltage, ...