Behringer ULTRA-DI DI20 Mode D'emploi page 4

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ULTRA-DI DI20
By using the GROUND switch, you can interrupt (LIFT) the
(8)
grounding between the input and output. Depending on how
other devices connected to your DI-box are grounded, ground
loops can be eliminated.
◊ ◊
Never connect pin 2 or pin 3 to pin 1! Never remove the
screen protection on pin 1. Otherwise, you won't be
able to run the DI20 on phantom power (for example,
phantom power from a mixing console).
Battery compartment
To access the battery compartment, loosen the screw on the rear.