Wunder Audio CM50 - Manual (Page 4)

remove the lid.
You will see a small chrome toggle switch located inside the unit
directly next to the large AC transformer.
To set the switch to 115V, toggle the switch towards the
transformer. To set the switch to 230V, toggle the switch away from
the transformer.
Warning: Connecting the CM50 to the wrong AC voltage may
destroy the unit and cause fire and/or electric shock.
Replacing Fuses
The fuse protecting the primary circuit is located outside the PSU.
Unscrew the black fuse cover to open the fuse compartment.
Replace the fuse with a new fuse of the same type (T 500 mA for
115V; 250 mA for 230V) and close the fuse compartment lid.
AC Power Connector
If you are using the microphone in a different country, you may
need to connect the unit to a power outlet that does not match the
power connector on the supplied power cable. Purchase a matching
power cable locally that complies with IEC and local safety
standards and has a power connector with a chassis ground pin.
While in the same area, use this “local“ power cable only.
Shutdown and storage
Before switching off the microphone or disconnecting cables, reduce
the volume of the connected equipment. Only then should the PSU
be switched off.
Disconnect the cables. When disconnecting a cable, always pull only
on the connector housing and not the cable itself.