Pioneer SE-NC21M Mode D'emploi page 8

2 Using the headphones
Confirm the left/right orientation by the L/R marks or hinge color,
and place the headphones on your head. Adjust the length of
the headphones band for most comfortable fit.
3 Playing music
1. When power is ON
When the power switch is set to ON, the power indicator
lights green, and the noise-canceling function operates,
allowing you to listen to music without excessively raising
the volume, thus eliminating the need to raise sound volume
excessively, and reducing disturbance to nearby people.
* If battery is depleted, no sound will be audible.
2. When power is OFF
When the power switch is set to OFF, the noise-canceling
function stops, and the unit can be used as ordinary
headphones.
8
En
L: left (black)
R: right (red)
Hinge