Lenco IPD-4100 - Manual (Page 13)

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The Speaker Dock can be reset to return to the factory default settings.
1.Switch off the Speaker Dock and remove the plug from the wall socket.
2.To reset the Speaker Dock, remove the Backup Battery from the Memory Battery Compartment
as described in the previous sections.
3.Replace the Backup Battery after approximately 2 minutes. The Speaker Dock will be returned
to the factory default settings.