OPTO TECH CORP said unconsolidated sales in May fell 18.76% to NT$540,001,000 from NT$664,672,000, according to a statement filed to the Taiwan Stock Exchange.

(Figures are in thousands of New Taiwan dollars)

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5/2012 5/2011 Sales 540,001 664,672 YOY% -18.76%

-----------------Year-to-date----------------- Sales 2,633,633 3,145,860 YOY% -16.28% =================================================================