Referring to options 

-$vpro->Units('imperial') if ( $imperial );
-$vpro->SetTime() if ( $set_time );
-$vpro->Backlight($backlight) if ( defined($backlight) );
-$vpro->Template($template) if ( defined($template) );
-$vpro->SetInterval($interval) if ( defined($interval) );

+$vpro->Units('imperial')           if $opt{imperial};
+$vpro->SetTime()                   if $opt{settime};
+$vpro->Backlight($opt{backlight})  if defined $opt{backlight};
+$vpro->Template($opt{template})    if defined $opt{template};
+$vpro->SetInterval($opt{interval}) if defined $opt{interval};