Meters music OV-1 Manual De Usuario página 6

Three-Way Switch:
There is a three-way switch located on the side of the ear cup behind the
suspension bracket on the left ear of the headphones. The features are detailed
below in fig 1.0.
Fig 1.0:
3-Position Switch
VU Lights on No ANC
VU Lights OFF No ANC
VU Lights & ANC