3
Pair button
on/off switch
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Mac/PC
mode switch
charging port (with included cable
and connected to a USB charger or Mac/PC)
LED indicator:
1, charging:
red, and off (when full)
2, pairing: flashing blue
3, OS mode
PC: blue...off...blue...off...
Mac: off
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Num Lock
PC
Mac
=
Pair
Off
On