Artsound U3 Instrucciones De Manejo página 7

Power the radio
Note:
Insert back up battery prior to main batteries.
GB
Back up battery is to back up the preset stations and also clock.
It is necessary to insert back up battery (2 x UM-3 .5V, not sup-
plied) for memory back up even if you use AC power only. Without
the back up battery, time and preset station will get lost if remove
AC power cord from AC outlet or during AC power failure.
Back up battery compartment is located inside the main battery
compartment. Insert 2 x AA size (UM-3) battery and ensure the bat-
tery is inserted in accordance with the diagram shown.
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