ART Pro Audio DIO - A/D Converter - Manual (Page 9)

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POWER JACK
An external 9 Volt AC adapter powers the DI/O. Plug the adapter into
the PWR jack and then into a power outlet. Only use the adapter that
comes with the DI/O. If the adapter ever becomes damaged,
immediately discontinue use. They can be purchased locally or directly
from ART. Just make sure that you specify 9 Volt AC output (not DC),
at 800 ma.
Fill in the following information for your reference:
Date of purchase ___________________
Purchased from ___________________
SERIAL NUMBER ___________________