Yamaha YAS-107 Mode D'emploi page 13

Preparing the remote control
Remove the battery's insulating strip before attempting to use the
remote control.
Battery's insulating strip
Operating range of the remote control
Operate the remote control within the range as shown below. When
the unit is mounted on a wall, point the remote control at the remote
control sensor on the top panel (p. 17, 19).
Remote control sensor
Within 6 m (20 ft)
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En