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Keyboard Parameters: Working mode: 2.4G+BT5.0/3.0 Bluetooth Wireless Operating frequency: 2408- 2474mHz Working voltage: 3.7V . Machine current:≤10mA Interface type: Rechargeable Type-C Transmission distance: 10m Charging time: 2-3 hours Battery capacity: 200mA Number of keys:84 keys Key life: 50000000 cycles Max Keyboard size: 389.8*132.2*21.5mm Keyboard monomer weight (g):371±5g Package size: 335 * 167 * 31mm Package weight: 580g   Package included: 1x 2.4G+BT3.0/5.0 85Keys Wireless keyboard 1x English User manual 1x TYPE-C Charging cable     Support operating system: PC Win2000/Win XP/WINME/Vista/Win7/ Operating systems such as Win8/Android/Linux/Apple.   FN   +   key combination function: FN+1=MediaFN+2=VolumeFN+3=Volume+ FN+4=MuteFN+5=Prev TrackFN+6=Next Track FN+7=Play/PauseFN+8=StopFN+9=Home FN+10=EmailFN+11=CalculatorFN+12=Favourite FN+1=BT1FN+2=BT2FN+3=2.4GFN+Q=Apple FN+W=AndroidFN+E=WindowsFN+X=SCRFN+C=PAU Esc+Q=keyboard pairing   Instructions: Step 1: Insert the receiver into the computer USB port; Step 2: Turn on the power switch at the bottom of the keyboard, when the mouse pointer appears on the screen. Mode switching: This product has 2 bluetooth channels, press "FN+1/2" to switch the bluetooth mode,When working in bluetooth mode; press "FN+3" to switch between bluetooth and 2.4G.   TIPS: Switch the corresponding working mode when using, (if some users use the Bluetooth mode on the mobile phone/tablet for the first time, and use it on the computer for the second time; to switch the 2.4G mode by pressing "FN+3", if He forgot to switch the receiver plugged in and it wouldn't connect.)