Bang & Olufsen 3 Beoplay M3 Guia Del Usuario página 25

Buttons and connections
C Standby button Short press to put M3 in standby. Long
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press to turn M3 off. D Reset button Short press both
buttons C and D to enter setup mode. When in setup mode,
short press both will cancel setup. E Line in Mini-jack for
connecting external audio sources. F Power Connect M3 to
mains supply using only the enclosed mains cable.
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