CME U4MIDI WC User Manual page 7

USB port is only for connecting to an operating system, not for connecting a MIDI
controller via USB.

DC 9V power socket
You can connect a 9V 500mA DC power adapter to power the U4MIDI
WC. This is designed for the convenience of guitarists, allowing the interface
to be powered by the pedalboard power source, or when the interface is
used as a standalone device, such as a MIDI router, where a power source
other than USB is more convenient. The power adapter is not included in
the U4MIDI WC package, please purchase it separately if needed.
Please choose a power adapter with a positive terminal on the outside of
the plug, a negative terminal on the inner pin, and an outer diameter of 5.5 mm.

WIDI (Option) button and internal expansion slot
This button has no effect when the optional WIDI Core Bluetooth MIDI
module is not installed.
U4MIDI WC can be equipped with CME's WIDI Core module to
expand the 16-channel bi-directional wireless Bluetooth MIDI function. For
installation instructions of the WIDI Core module, please refer to the printed
installation guide in the package, and for technical specifications, please visit
the product page www.cme-pro.com/widi-core/. This module must be
purchased separately.
With the optional WIDI Core Bluetooth MIDI module installed, this
button can perform specific shortcut actions. First, please make sure that the
WIDI Core firmware has been upgraded to the latest version. The following
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